IRC t 41-1997

GUIDELINES FOR TYPE DESIGNSFOR

CHECK BARRIERS

(First Revision)

THE INDIAN ROADS CONGRESS

1997

IRC:41-1997

GUIDELINES FOR TYPE DESIGNSFOR

CHECK BARRIERS

(First Revision)

PublishedbyTHE INDIAN ROADS CONGRESS

iamnagar House,ShskjahanRoad,NewDeihi-ilOOll

1997

PriceRs.801-(pluspackingandpostage)

IRC:41-1997

First published:August,1972Reprinted: June,1983Reprinted:September,1990FirstRevision:April, 1997

(RightsofPublicationandofTranslationare reserved)

Printed at Sagar Printers & Publishers,New Dcthi-110003(1000copies)

IRC:4 1-1997

MEMBERS OF THE HIGHWAYS SPECIFICATIONS ANDSTANDARDS COMMITTEE

(As on 31.3.96)

3. G.C. Garg Engineer-in-Chief, Municipal Corporationof Delhi, Town Hall,Delhi-Il 0006

4. Di. M.P. Dhir Director, CSIR (Retd.),A-1/133, SafdarjangEnclave, New Delhi-I10029

5. R.N. Malik ChiefEngineer(Mech.), Ministryof SurfaceTransport(Roads Wing), NEWDELHI

6. G.S.Tawannalani AddI. Director General (S&P), CPWD,Nirman Bhawan,New Delhi-I 10011

7. Dr. AK. Gupta Professor & Coordinator, CentreofTransportEngg., UniversityofRoorkee, Roorkee

8. l-l.P. Jamdar Secretaryto theGovt. of Gujarat,R & BDeptt.,Block No.14, SachivalayaCranplet,Gandhinagar-382010

9. M.B.Jayawant Synthetic Asphalts,103, Pooja MahulRoad,Chembur, Bombay-400074

10. KS. Narayanan ChiefEngineer(CCU),Mb. Environment &Forests(Retd.), E-23, CentralGovt.Qirs.,

St. Martin Marg, New Delhi-I10021

11. PD. Agarwal Chief Engineer(Nil.), UP.PWD,Lucknow-226001

12. Maj. C.R. Ramesh Engineer-in-Chief,Public HealthEngg.,AnandaRaoCircle, Bangalore-560009

13. Dr. L.R. Kadiyali ChiefConsultant, Dr.L.R. Kadiyali &Associates,S-487,U~lFloor, GreaterKailash-I, New Delhi-110048

* ADG(R) being not in position,themeeting was presidedby Shri A.D. Narain,DG(RD).Govt.of India, MOST

1. A.D. Narain1

(Convenor)

2. S.C. Shamia(Member-Secretary)

DG (RD), Ministryof Surface Transport(Roads Wing),New Delhi

ChiefEngineer(R) Stds/R, MinistryofSurface Transport (Roads Wing), New Delhi

(i)

IRC:41-1997

14. Ninan Koshi

15. TheDirectorGeneral,

16. Dr. S.RaghavaChan,

17. Vinod Kurnar

18. P.J.Rao

19. Prof. G.V. Rao

20. Prof. C.G. Swaminathan

21. B. Megu

22. M.K. Saxena

23. Prof. D.V. Singh

24. The Director

25. A.Sen

26. R.D. Mebta

27. S.C.Sharma

DG(RD),MOST(Retd),56, NalandaApartment,Vikaspuri,New Delhi-I 10018

NationalCouncil for Cement& BuildingMaterials,P-21,SouthExtn. II, RingRoad.NewDelhi-I 10049

TransportEngg.Section,Deptt.of CivilEngg., RegionalEngg.College,Warangal

Director& Head(Civil Engg.),BureauofIndianStandards,Manak Bhawan, 9,BahadurshahJafarMarg, New Delhi-I 10002

Dy. Director& Head,GeotechnicalEngg.Division,CentralRoadResearchInstitute,Delhi-MathuraRoad,New Delhi-I 10020

Prof. of Civil Engg.,1.1.1.,HauzKhas,NewDelhi-I 10016

‘Badii’, 50, ThiruvankadamStreet,R.A. Puram,Madras-600028

ChiefEngineer(Zone-I), ArunachalPradesh,PWD, Itanagar-791III

Director,NationalInstitute for TrainingofHighwayEngineers,174,JorBagh,New Delhi-I 10003

Director,CentralRoadResearchInstitute,Dclhi-MathuraRoad,P.O.CRRI,Okhla,New Delhi-I 10020

HighwayResearchStation,Guindy,Madras-600025

ChiefEngineer(Civil). Indian RoadsConstructionCorpn. Ltd., 6,’ Core,6thFloor,ScopeComplex,Lodhi Road,New Delhi

ChiefEngineer(T&T), Ministry of SurfaceTransport (RoadsWing), New Delhi

ChiefEngineer(R),S&R, Ministry of SurfaceTransport(RoadsWing), New Delhi

(ii)

IRC:41-1997

35. A.K. Mishra

36. Il.S. Rhatia

37. R.K. Jam

35. President,Indian RoadsCongress

39. Hon. Treasurer,IndianRoadsCongress

40. Secretary,IndianRoadsCongress

ChiefEngineer (Plannning), MinistryofSurfaceTransport (Roads Wing),New Delhi

Prof. of Civil Engg.. Facultyof Engg.-Civil, BangaloreUniversity,Bangalore

B-I 1/8164,VasantKunj, New Delhi-I10030

ChiefEngineer (B)Std.bR,Ministryof SurfaceTransport(Roads Wing).New Delhi-Il000l

D.G.W., E-m-Chief’sBranch, Army Hqrs.,KashmirHouse,DHQ P0,New Delhi-110011

Prof.& Head, Deptt. ofTransportPlanning,Schoolof Planning & Architecture,4,Block-B, Indraprastha Estate, New Delhi

Chief Engineer, Dy. Director GenerallDSDte. General BorderRoads, Kashmir House,DHQ P0,New Delhi-I 10011

Director (Technical),Oil CoordinationCommittee,2nd Floor,Core-8, Scope Complex,7, Institutional Area,Lodhi Road,New Delhi-I 10003

Chief Consultant, Engineers& ManagementAssociates,3/5, Kalkaji Extn.,New Delhi

Projectl)irector,ADD Project, Kothi No.1,Nirman Kunj, Sector-I6A,Faridahad

M.S.Guram, - Ex-OfficloChiefEngineer, Punjab PWD,B&R Branch,Patiala

A.D. Narain, - Ex-OfficioDirector General (Road Development),Ministry of Surface Transport(Roads Wing),New Delhi

CORRESPONDINGMEMBERS

I. L.N. Narendra Singh

2. R.S.Shukia

3-36,Plot86, KakateevaApartments,Patparganj. Delhi-l10092

B-I90, Sector.55, Noida-201301

28. R.L. Koul

29. Prof. C.E.G. Justo

30. OP.God

31. M.R. Kachhwaha

32. Maj. Gen.C.T. Chari

33. Prof. N. Ranganathan

34. B.N. Srivastava

S.C. Sharma - Ex-OfficioChief Engineer (R), MinistryofSurface Transport (RoadsWing),New Delhi

(iii)

IRC:41-1997

1. Introduction

2. Scope

3. Type Design of Check Barrier

4. Designs

5. Signs,MarkingandLighting

6. Offices,WeighBridgesandotherFacilities

7. SafetyMeasures

8. RoadSideDevelopmentControls

ANNEXURES

Annexure-l -

Annexure-2-

CONTENTS

Page No.

1

3

3

4

9

ii

12

12

13

15

CheckBarriersin UrbanAreas -

UserGuidelines forPlanningof

Parking Bays at CheckBarriers

Electrically Operated BarrierGateAnnexure-3 -

IRC:4 -1997

GUIDELINES FOR TYPE DESIGNS FORCHECK BARRIERS

I. INTRODUCTION

1.1. Theneedfor therevision oftheexistingIRC Standardon “TypeDesignsforCheckBarriers”was felt by theTraffic EngineeringCommittee(1’EC)in 1987. Therefore, in ILS mecling held on 12th June, 1987 a Sub-CommitteecomprisingShri R.P. Sikka,Chief Engineer(Traffic & Transportation),MOST,Shri J.B. Mathur, Dy. Secretary, IRC and Shri D. Sanyal (NATPAC),Member-Secretary of Traffic Engineering Committee, was formed torevisethescope of the standard so as to includedesignaspects,drainage and otherfacilitiesfor thecheckingauthorities aswell for thedrivers ofthevehicles.Thereviseddraftpreparedby ShriSanyalwas discussedinTECmeetingheldon23rd August,1991.A Sub-Group consisting ofSfShri M.K. Bhalla, Member-Secretary, TEC,V.K.Arora, Chief Engineer, MOST and D.Sanyalwas constituted to reviewthe draftand revise it inthe light of the commentsofferedby the members in thesaidmeeting.The draftpreparedby this Sub-Group was againdiscussedin theTrafficEngineeringCommittee in itsmeetingon 31stAugust,1992 whensomeadditionalcommentsweregiven by themembers.The draftwas again discussed duringthemeeting of Traffic Engineering Committeeheld on 18th October,1993 whenmembers felt that it required furthermodificationin thelight of thediscussions.ASub-Group was again constituted comprising ofS/Shri D. Sanyal, T.S. Reddy,Maxwell Pereira,A.P. BahadurandDr. Vishwanath to finalise thedocument.Thedocument wasfinally discussedby TEC (personnelgiven below) in itsmeetingheldon 31stAugust, 1995and approved.

R.L. KoulCE(T&T), MOST ... ConvenorA.P. BahadurSE(T&T), MOST ... Member-Secretary

Members

Dr. L.R. Kadiyali Dr. P.S.PasrichaD.C.P.(Traffic), Delhi Police Prof.N. RanganathanDr. A.C. Sama T.S. ReddyDr. M.S. Srinivasan Prof. P.K. SikdarD. Sanyal Dr. AK. GuptaR.G. Gupta Nirmal ut Singh

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IRC:41-1997

Dr. S. Vishwanath Prof.DineshMohanArun Mokashi H.C. SethiBrig. S.B. Joshi S.S.Rathore

CorrespondingMembers

M.K. Agarwal Adviser(Transport),DTR, MOSTV.V. Thorat Prof. B.R. Marwah

Prof. S. RaghavaChari

Ex-Officin Members

President,IRC (K.K. Madan) DG(RD). MOST(MV. Sastry)Sccrc~tary.IRC (S.C. Sharma)

1 .2 TheHighwaysSpecifications& StandardsCommitteediscussedthedraft in its meetingheldon 19th March,1996andapprovedthedraft forbeingsent to the Council after the commentsreceivedfrom the memberswere dulyincorporated. The guidelineswere approvedby the ExecutiveCommitteein itsmeetingheld 17thApril, 1996 and theCouncil in theirmeetingheldatDarjeclingon 24th May, 1996.

1.3. It hasbeennoticedthat highwaycheck barriersin useatpresentareoften crudeimprovisations,andare unsatisfactoryfrom thepoint of view ofbothsafetyandfreeflow of traffic. Moreover,theyhaveusuallynoproperlightingarrangementsand warning deviceslike signs, at their approacheswhich causesfurtherhazard. -

1.4. The Indian RoadsCongressas a body is totally againsttheerectionof anybarrierson roadssincetheseactas an impedimentto the smoothhow of vehicles,therebydestroyingthefunction of thehighway,besidesbeingasourceof accidents.But in the interestof roadusersit hasbeenfelt that thedesignsof barriersmight bemadeaslessobjectionableas possible.Towardsthis end,theHighwaysSpecificationsandStandardsCommitteehasevolvedthe type designsgiven hereinforgeneraladoption.

1 .5. Thepublicationof theseGuidelinesshould,however,in no wayhe takento meanthat the basicpolicy of the Indian RoadsCongressin regardtohighwayharriershasundergonea change.Thesedesignsshouldhe madeuseofonly whenit becomesunavoidableto havea harrier.

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IRC:41-1997

2. SCOPE

This document dealswith guidelinesfor typedesignsof highway checkbarriersexcluding toll tax collectionbarriers for which the Ministry of SurfaceTransport hasissued separateguidelines. Type designfor checkbarriers in urbanlocation hasalsobeenbriefly covered.

3. TYPE DESIGN OF CHECK BARRIER

3.1. Thereare difft’rent typesof check barriers in use for differentpurposesand at differentlocations.Themoreimportanttypesof check barriersinuseareas follows:

(i) Highway check barriers

Such check barriers are usually erectedfor the purposeofcollectionof salestax, octroi tax,commercialtax andentrytax.Thesearealso attimesusedfor thepurposeof checkingby forestandroadtransportauthorities;

(ii) Toll barriers

This is a specialtypeof barrier that isspecifically used for thepurposeof collectionof toll;

(iii) Check barriers in urban areas

Check harriers in urbanareasare usually erectedfor securitypurposeby localpolice authorities.

3.2. Design of check barrier is a highly case-specificexerciseandeachdesignhas to takeinto account variouslocal considerations including trafficrequiremenLsandphysical constraints peculiar to anyspecific site. However,certain degreeof uniformity and consistency indesignmustbemaintained for thepurpose of ensuringthe desired levelsof safety,efficiency and economy of trafficoperationthrough suchareas.With a view toprovide uniformity and consistency,three type designs, applicable tothe most commonlyoccurringsituations, aregiven below:

(i) Highway check barrierswith lay-byeson oneside - Plate IThis is applicable to all roadswherechecking is requiredforvehicles on one lane only i.e. while entering or exiting ajurisdiction of anauthority.

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IRC:41.-1997

(ii) Highwaycheckbarrierswith lay-byeson bothsides-PlateII

Thisis themostcommontypeof designrequiredat all inter-stateborderlocationsandon entry into major townsor cities.Thisisrequiredwhere checkingof commercial traffic is requiredinbothdirectionsfor purposesof tax collectionetc.

(iii) Checkbarriers in urbanareas- PlateIll

A brief descriptionof checkbarriersin urbanareasis placedinA nnexure-i.

3.3. The choice of a design shall be basedon a considerationofconditionsexistingatsite includingthevolumesof traffic requiringcheckingandbeingallowedfreepassage.Thesedesignsmay bemodified, with theapprovalofthe HighwayAuthority,to suit local siteconditions.

4. DESIGNS

4.1. Location

Thebarriershall besolocatedasto bevisible from a sufficient distanceaheadwhenapproached from eitherdirection.Thisdistanceshallat- leastbeequalto thestopping sight distance correspondingto thedesignspeedofthehighwayonwhich the barrier is set up. For sightdistance values,referencemaybe madetoIRC: 66-1976“RecommendedPracticefor SightDistanceon Rural Highways”.

4.2. Surveys

4.2.1. Thedesignof harrierdependslargelyon thepurposefor whichit is to beputup, thelengthoftimeit is likely toremaininoperation,traffic volumes,permissibledelaysandqueuelengths.The studiesto becarriedout for designofcheckharriersareasfollows:

(i) Traffic volume survey, parking surveys (in casevehiclesarebeing madeto halt);

(ii) Roadandspaceinventorysurveys;

(iii) Requirementsof the concernedauthoritiesat the proposedsiteof thebarrier.

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IRC:41-1997

4.2.2. Traffic volume surveys

Sevendayscontinuous,categorywise,traffic volumecounts,preferablyduring peakseason,are to he takenat the location (or within its inhluencearea)whereacheckbarrier is proposedtoheerected.If dueto somelocal constraints,itis not possibleto carry out the sevendayscount,at leastthreedayscontinuoustraffic volumecountmust be done. Thisdatais to beanalysedfor findingouttheaveragenumberof commercialandoLhervehiclesthat may havetobe handledattheharrier.Dependingon past trendsor, on thebasisof anyotherstudycarriedout,this datashallbeprojectedfor thedesignperiodof 15 years(aftercommissioningof facility) forestimatingthedesignvolumeforwhich lay-byesaretobeprovided.Sucha traffic volume surveywill alsohelp to ascertaintheactualnumberof lanesthatwould herequiredtoheprovidedat andnearsuchaharrier.Caremusthe takento accountfor seasonalfluctuation in traffic whereversuchtrendsare known toexist such traffic volume.surveys,as mentionedhere,are also recommendedatlocationswhereredesignolan exislingcheck harrierbecomesnecessary.

4.2.3. Parkingand accumulationsurvey

4.2.3.1. At locations wherecheck harriersalreadyexist, both parkingaccumulationandparking duration surveysneedto he carried out. In caseofqueuingat suchlocations,maximum queuelengthsarc also to he recorded.Thetimerequiredforservicingthequeuethroughthecheckharriermustalsohestudiedin this context. Parkingsurveyshouldhecarriedoutcontinuouslyfor a periodofthree(lays.Data,SO collected,shallheprojectedfor thedesignperiodforestimatingthe parkingdurationand parkingusage.Parkingsurveyis to he carriedseparatelyfor eachapproachdirection.

4.2.3.2. At localionswhereno checkharrierexists,(i.e. whiledesigninga new facility), the parkingdemandshouldhe on thebasisof expecteddelaysasmay haveheenobservedunder similar conditionselsewhereand the averageexistingparkingdemandif any,within the influenceareaof thechosenlocation.Continuoussurveyfor 24 hourson a sampledaymayhe adequateForthis purposeunderordinary circumstances.However, if peakingis known to occur on anyparticulardayof theweek,surveyshouldhecarriedouton suchdays.Parkingdatacollectedlike this is to heusedin conjunctionwith thedesignparkingdemandthatmay he estimatedfrom the numberof vehicles that would he servicedat theproposedlocation aftererectionof thecheckharrier. A samplecalculationin thisregardis placedatAnnexure-2.

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IRC:4l-1997

4.2.4. Roadandspaceinventorysurvey

Whetherit isl’or redesignof an existingcheckbarrierordesignof a newone,roadand spaceinventory surveysareessentialand mustbe carriedout withutmostcareandprecision.AccuratephysicalsurveyplansFor the roadstretchupto500mon eithersideof thedesignatedcheckharrierlocationmustbepreparedtoascaleof 1:500. Thesurveymust coverastripof lOOm on eitherside of thecenterline of the roadfor theentiredesignatedcheckharrierstretch.All physicalfeaturesincluding road landboundary,control lines.detailsof roadsidedevelopmentsandpropertiesandcrossroadsifany.drainagepatternof theareaetc.,musthecorrectlydepictedin the plan soprepared.~Vellgrown treesand their exact locationsmustalsohe markedon theplan.

4.3. (eometricDesign

4.3.1. Carriagewaywidth

The maximum width of carriagewaybr through traffic movementoftraffic mustnothe lessthan the formationwidth of theapproachroadfor a two lanehighway.Thusfor a two lanehighway with 7.Omof approachcarriagewaywidth,thethroughcarriagewayanticcheckbarriermusthe 12.Omwide while, in thecaseof four lane divided section of approachcarriageway,the minimum width ofthroughcarriagewayat the lay-by mustnothe less thanS.5min eachdirection.

4.3.2. Lay-by

4.3.2.1. Length : Thelength of the lay-by (s) shouldheadequatetocaterto peakparking demandestimatedon volume proiectioflS and averagedelaysexpected.

4.3.2.2, Width : Each lay-by must be two lane wide (7.5m) so as toenableparkingof onevehicleon the left. sideandanothervehicleto passtheparkedvehiclesalongthe adjacentlane. Islandsseparatingthe lay-hyswithin the parkingarea should have adequatewidth and in any case,not less than I .5m foraccommodatingvariousservicelines,electricpolesetc.

4.3.2.3. Entry/exit : Entry to and exit from lay-by(s) shall hedesignedwith a taperof not lessthan 1 in 15 an(l no entry/exit curve(turning)shall be lessthan 18.Omin radius.Formulti axlevehicles,the turning-radiusmay be increased.

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IRC:41-1997

All edgesandcornerswithin this areamustbesuitablyroundedoff.

4.3.2.4. Segregationof lay-by from maincarriageway: Segregationof the lay-by from themain carriagewayis tobeachievedthroughtheprovisionofa harrier islandwith a minimum width of 3.Om.This islandmusthavesuitableguardrails. No busbaysare to heprovidedwithin the influenceareaof thecheckbarrier.

4,4, Barrier Gate

Whereverpossible,theelectricallyoperatedbarriergatemaybeprovidedat the existlaneof the checkbarrierasper thedetailsmentionedin Annexure-3.Details of manuallyoperatedharriersareshownin Fig. I.

4.5. Vertical Clearance

Theverticalclearancebelow theharrieron themain carriagewayshallhesuch as to allow movementsof light motor vehicles~,governmentvehiclesandmilitary vehicleswithoutanyinterruption.Undernormal circumstancestraffic onthe main carriagewaywill not he required to stop at the harrier. The verticalclearancebelow the harrieron the main carriagewayshall not heless than 2.5mandsuchbarrierwill hedesignatedashigh harriers.

The barriersacrossthe lay-hy musthavea moreeffectivecontrolon thepassageof vehiclesthroughtheselanesand as such,the vertical clearancebelowtheharriersacrossthe lay-by shallhel.5m. Suchharrierswill hedesignatedaslowbarriers.

4.6. Pavement Design for Lay-by

The pavementFor the through carriagewaymust he designedas perIRC:37-1984.The pavementfor lay-hysshould be designedkeepingin view thelocal soil characteristicsand theexpectedloadingpatternsin the proposedlay-bys.Referencemaybemadeto IRC:37-1984 for this purpose.

4.7. Drainage of the Area

The entireareaoccupiedby the lay-hys musthaveadequatedrainagefacilities.The agencymaintainingthecheck harrierareamustensureregularandeffectivecleaningof gully pits and drainagechannels.Usually theareamusthave

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IRC

:41-1997

I.I.I.E

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IRC:4l-1997

a longitudinal slopeof not lessthan0.5%. Theparking bays withinthe area mustalso have a transverseslopeof 2%. Gully pitsshould normally be located with silttrap at a distanceof 30m c/c. The paved parking area will haveundergroundtransverse drains madeup of precast concrete pipes. The gully pits should besuitablyconnectedto suchtransversedrainsthat would ultimately dischargeontothe main drainrunning along the highway. Thediameterof the pipe drains willhave to be determinedon thebasisof designdischargeand,in no case, shouldbelessthan300mm.At places wherethedrainagewill have tobelinked witha nearbyculvert,thecorresponding levelswill have tobe designed keeping inviewtheinvertlevel of the drainagechannelat the culvert.While decidingthedirection ofslopesetc., thegeneraltopography ofthe areamust bekept in view. Adequate drainagefrom toilets to sewers and soakpits shouldbe provided.

5. SIGNS. MARKING ANt) LK;HTI\(;

5.1. Signs

The entire area aroundthe lay-bysmust have adequatesignagesso as togui(lethe driversefficientlythroughthearea. Beingessentiallyaneccentricdesign,adequate care musthe taken to evolvethe signage and marking schemein ascientific andcasespecific manner.Rctrorcflective sheeting shall preferably beUSe(l.

Some of the more important signs tohe put up at any highway checkharriers arc asfollows:

5.1.1. Warning signs

The signs “Slow - Barrier Ahead” (Fig. 2) and “Dead Slow - BarrierAhead”(Fig. 3) shouldheplacedat 200mand 1 20mrespectively in advanceofthehigh barrierlocation.

5.1.2. Mandatorysigns

Mandatory signssuchas “Compulsoryleft turns for HTVs and MCVs”etc., must be provided 60min advance ofthe high harrier location. Preferably,gantrymountedsignsshouldbe providedfor bettervisibility.

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IRC:411997

RED BORDER

DEViCE PAINTED BLACK

CENTRE WHITE

T—IRON POST

8cm x 8cm x 8mm

~‘LM ? ~ tALL OIMEP~S4ONSARE IN CENflUETRES

Fig. 2 Warning S’gn for “Slow Barrier Ahead”

RED BORDEFI

PLATE WHITE

BLACK LETTERSPLATE WHITE

BLACK

ALL D’IENSIONS ARE IN CENI1METRES

Fig. 3 Warning Sign for “Dei I Slow - Barrier Ahead”

RED

PLATE WHITE

PLATE WHITE

RED BORDER

WHITE

t ‘P ¶T—IRON POSTScM, km B.nm

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IRC:41 -1997

5.1.3. Informatory signs

Informatory signsindicatingvarious facilities/amenities available mustbe provided at appropriate places.

5.2. Marking

Thecarriagewaysand the lay-bys, including theapproachareasmust haveproperpavementmarkingsfor traffic guidance asperIRC:35 (underrevision). Asfar as possible thermoplasticpaintsmust heusedforpavementmarkingpurposes.In order tofurtheraccentuatethe lay-hys,suitabledclineatorsshould he installedat theentry/exit areasto/from the lay-by.

5.3. Lighting

The entirearea,includingtheparking areas, mustbeproperlyilluminated.Roadside/medianlighting may beprovidedwith thehelp of sodium vapurlampsallowing a 6mclearanceoverthecarriageway. Lamp postsmay be located at 30mc/c. Provisionof adequate high mastlighting maybeconsidered forparking areas.

6. OFFICES, WEIGH BRIDGES AN!) OTHER FACILITIES

6.1. Offices

Checking offices willessentiallyhesturdystructureswith a covered areaas perthe requirements of theconcernedagencies/govt.deptts.The checking officemust have adequate visualtransparency.Theseshouldbe properly equipped withtoilet, drinking waterfacilities,etc. Provisionmayalsobe madefor Police Boothsif required.Theseoffices mustbeconveniently located withadequate space forthedrivers toqueueup undershade.TI-c entire area around these offices must beadequatelylighted.Partof the office structure shouldproject intoeitherlay-hys orthe carriageway.

6.2. WeighBridges

Generally,eachseparateservicechannelmust be provided witha flushtypeweighbridge forcheckingtheladenweightsof commercialvehicles.In orderto facilitate the entire process of checking,such weigh bridges must be locatedbefore entry tothe idle parkingarea.Theweighing bay must havecertainofiicespacefor the inspector.

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IRC:41-1997

6.3. WaysideAmenities

Waysideamenitieswould generallyincludeeatingplaces,drinkingwaterpoints,toiletsandwashingareas,public telephone,first aid facilities etc. Fillingstations,autorepair shops,sparepartsshopsetc.,mustbe locatedat least500mawayfrom thelay-by area.No suchdevelopmentshouldbeencouragedalongtheoppositeflank of theroadwithin the influenceareaof thecheckharrier.If thereare other built up properties along the road over thissection,effortsmustbemadeto servesuchpropertieswith the helpof serviceroads.

6.4. Landscaping

Beautificationof checkbarrierareasshouldhedoneon a scientific basisthroughproper landscaping/plantationetc. Landscapingmustbe donein suchamannerthat it coulddiscourageencroachments.Low heightplants/shrubsshouldheplantedon medians/islands,separatingthe lay-hys.

7. SAFI~TY MEASURES

7.1. Thebarriershall he paintedin alternateblack andwhite bandsof 25cm width soasto improveits visibility.

7.2. Forsafetyof night traffic,a railway type lampand red reflectorshallbe fitted to thebarrier.

7.3. In urbanareas,flickering electriclights shouldbeprovidedonapproachesto theharriersif considerednecessaryby the traffic authority.

7.4. All the safety devicesmentionedabove must be kept wellmaintainedandfunctioningproperly.Thisappliescspcciallytopavementmarkingsandthelampsfornight traffic.

S. ROAI) S1I)E DEVEI.OPMENT CONTROLS

No uncontrolledroad side developmentmustbe permitted within theinfluenceareaof thecheckharrier.Barringwaysideamenitiesessentialfor waitingdriversandcleaners,no otherusesmustbepermittedadjacentto the lay-bys.

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IRC:4l-1997

Annexure-1

CHECK BARRIERS IN URBAN AREAS

Check barrierson urban roadsare usually put up for securityreasonsgenerallyby the concernedpolice departments.Theobjective behind erectionof suchharriers is to slow down thetraffic and bring such vehicles to a halt as are considerednecessaryby thepolice personnel.

2. Check harriers along busy urban streets are obviously animpedementto smooth flow of traffic and the erectionof thesamemust,therefore,hedecidedveryjudiciously.Suchbarriersmustnot he left unattendedat any timeof day or night.

3. Visibility along urbanstreetsis of paramountimportanceandassuch,the harriers used in urbanareasmust ensureadequatevisibility across(he baffles.

4. Since all vehicles are usually not required to he stoppedorchecked,the barriers in urban areasare required to havesegmentalconstructionand layoutas shown in Plate III.

5. Usually mobileharriersare madeuseof in urbanareasas thesemay he requiredto he moved to different pointsdependingonthe exigencyof the situation.A typical designof sucha checkbarrier is shownin Plate ill.

6. Extreme caution must he exercisedtowards placing of suchbarriers along urban streets. Thesemust be placed only onstraight sectionsof roads having adequatewidths and clearvisibility. Thesemustnotbeplacedcloseto an intersectionor aside road. Whenplacedacrossan undividedcarriageway,caremust he taken to ensurethat sufficient space is available forsimultaneousmovement of two opposing files of vehiclesthrough harrier location. For better visibility at night suchbarriersmust hepainted in yellow and musthe placedat a welllit portion of the road. Additional visibility and safetymustbe

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IRC:41-1997

ensured,if necessary,through the use of flickering lightsmountedon the barrier frame.

7. A restroomfor securitypersonnelmustbeprovidedat locationswheresuchbarriersareerectedon a permanentbasis.

8. Under no circumstancesthe barriers should obstruct themovementsof pedestriansalong the footpaths.

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IRC:41 -1997

Annexure2

USER GUIDELINES FOR PLANNING OF PARKING

BAYS AT CHECK BARRIERSIt is proposedto setup a checkbarrieralonga NationalHighwayhaving

surveyedA.D.T. of 500(1 vehicles. Thevariousdesignparameterscould then,becalculatedasfollows:

Given AverageDaily Tralflc Volume - 5000vehicles

Volumeof commercial vehicles(asmaybe assumedor as may be revealedby actual field surveys) - 40% ofADT (say)

Totalnumber of commercial vehicles - 2000v .p.d.Directionalsplit - 60:40(say)

Volume of commercialtraffic in - 2000x0.6v.p.d.predominantdirection - 1200 v.p.d.

Peakhourpeakdirectioncomponent - 10%Peakhourarrivals - 1200x0.l0v.p.h.

- 120 v.p.h.

Averagetimerequired for checking(assumedor verified from anothercheckbarrier) - 5 minutes (say)

Handlingcapacityof a singlechannelservicechecking window facility - 12v.p.h.

If aneffort is tobemadeto matchtheserviceratewith therateof arrivals,thisparticularcomplexwould require10servicechannels(checkingwindows).Incaseit is notpossibleto provideadequatenumberof servicechannels(10 in thepresentexample)numberof windows could be reduceddependingon siteconstraintswith suitableincreasein the lengthsof the lay-bys. However, theservicerate,undersuchcircumstances,beinglessthantherateof arrival,onecouldexpectbuildingupof queuesfor which separateholdingareasof adequatecapacitymust be planned. Forexample,if only 4 servicewindows canbe providedatthesite,insteadof 10service‘~vindowsasdescribedabove,thenumberofcommercialvehicles,that couldbeservicedin 1 hourwork out to (60/5 x 4)48.Thereforetheidle parkingrequirementwould be (120-48)-72vehiclesduring thepeakhours.Howeverthetotal requirementof the idle parkinglot mustbeassessedon thebasisof theavailability of landandotherlocal considerations.

15

dli

IRC:41-1997

A nnexure-3

ELECTRICALLY OPERATED BARRIER GATE

Electrically operatedbarriergatesshall be providedatexit laneof thecheckbarrier. Thegateunit shall havethefollowing salient features.

(i) Remotepush-huttoncontrol from the toll booth;

(ii) Quick operation- 5 secondsfor lifting/lowering (90 degrees)for boomsupto4.5m lengthand8-10secondsforboomsin widerlanes. Howeverthe effective timeof openingwill be lessandthe vehicleswill heable to passwhenthe gateopensto anangleof about75 to Sf) degrees;

(iii) Automaticstop in fully raised/loweredposition and automaticlocking of the boom whereverit stops;

(iv) Alternatestripesof black and yellow or red and white on theboom for high visibility. Bands of reflective tape for nightwarningwould he required;

(v) Thedriving unit shallbe totally sealedfor externaluse;

(vi) Manualoperationof thegateshall bepossiblein caseof powerfailure or break down.

A generalarrangementof the harriergateis shownin Fig.4.

A separateswitchshallalso beprovided,operationof whichshallcutouttheautomaticcontrol andenabletheoperatortocontrolopening,closingandmidstoppingof theharrierby meansof the3 pushbuttonsprovidedina small barriercontrolbox besidesthecashregister. Thisdirectoperatorcontrol maybeusedbyhim in casea continuousstreamof vehiclesare passing,and he feelsthat thereisno needto openandclosethe harrierfor eachvehicle. Thisoverrideswitch mayalsoberequiredin caseof any failure of thevehiclesensorunit.

Theelectricallyoperatedharriershall havea systemfor disengagingtheelectricaldrivesystemfrom the boomandcounter-weights,sothat theharriercanbeoperatedby handjust asif it wasa manuallyoperatedharrier. This facility canbeusedin caseof powerfailure foroperationof theharrieror (luring breakdown.

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