MISSISSIPPI DOT I-55 SPLIT DIAMOND INTERCHANGE SMART WORK ZONE SYSTEM AND

PERFORMANCE MEASURES

Smart Work Zone Systems (SWZS), utilize computers, communication systems and other ITS field devices to inform motorists, reduce congestion, clear accidents, reduce secondary accidents and make work zones safer for the highway workers and the motorists.

www.MDOTTraffic.comwww.fhwa.dot.gov/workzones

Introduction

MDOT Goals for SWZS1. Safety a. Alert Drivers to slow or stopped traffic b. Clear accidents more quickly2. Reduce Congestion a. Monitor travel times b. Alert drivers of delays c. Provide information before decision points3. Evaluate for the Future

Goals

Vicinity Map

Project Map

47,000

71,000

33,000

20,000

Annual Average Daily Traffic

Project Background1. Funding Mechanism2. MDOT SWZS Philosophy3. Design Procedure4. Bidding Process

Project Design

I55 Split-Diamond Interchange ProjectMinimum Requirements1. 10 Portable Message Boards 2. 20 Side-Fired Radar Devices3. Typical Sign Messages Provided Normal: “Road Work Ahead, Reduced Speed Ahead” 35mph> “Congestion Ahead, Expect Delays” 5mph > “Slow Traffic Ahead, Expect Long Delays” Stopped: “Stopped Traffic Ahead, Prepare To Stop”

Specifications

Smart Work Zone System Delivered 1. Contractor Designed2. 13 miles vs 5 miles req’d3. 10 Signs Deployed vs 8 req’d4. No Devices in the

Work Zone5. Website and Field

Monitoring

System Delivered

ASTI Web Features

1. Mobility 1. Mobility

2. Safety2. Safety

3. Traveler Information

4. System Performance4. System Performance

Goals

SWZS Performance Measures

1. Mobility 1. Mobility

PM Mobility

SWZS Performance Measures

Rate of DiversionDelaySpeedsWork Zone Throughput

Travel TimesReduced DemandIncidents in the WZMaximum Queue Lengths

2. Safety2. Safety

PM Safety

SWZS Performance Measures

Number of CrashesCrash RateCrash SeverityCitationsReduction in aggressive maneuvers (forced merges)

3. Traveler Information

PM Traveler Information

SWZS Performance Measures

Web – Email AlertsSmart phone apps511Message BoardsHighway Advisory RadioSurvey Questions

4. System Performance4. System Performance

PM System Performance

SWZS Performance Measures

Error logsMissing dataDown timeWeb site featuresBenefits – Users perspective

Sample Report

Speed, Volume, Occupancy Report

Speed Data

Volume Data

Occupancy Data

PM Report

7:00

57 58 59 60 61 62 63 64

January 2013 Speed Chart - SB 1st Lane

28-Jan21-Jan14-Jan7-Jan

ITS Installations

Future Performance Measures1. Spot Speed Studies2. Project Diary3. Crash Report Analysis4. Continue to develop PM Reports5. Integrate info 5116. Survey Questionaires

QUESTIONS ?ACEY ROBERTS P.E.

ITS Engineer aroberts@mdot.state.ms.us