Trinity Parkway Alt Ramp Analysis _01!21!2016

8/18/2019 Trinity Parkway Alt Ramp Analysis _01!21!2016

1/18

Trinity Parkway Alternate Access Analysis

North Central Texas

Council of Governments

January 21, 2016

1


2/18

Purpose of Access Analysis

• Evaluate the potential deferment of access points at the north andsouth end of the Trinity Parkway (i.e., IH 35E / SH 183 interchange,IH 45 / SH 310 interchange) for Phase 1

• Evaluate which cross street ramps should be constructed as part ofthe Phase 1 Trinity Parkway project

2


3/18

Overview and Assumptions

• The project is currently proposed to be constructed in two phases:oPhase 1 - A 4-lane facility (with limited auxiliary lanes and some cross street

ramps)

oPhase 2 - Ultimate buildout to include 6 main lanes, auxiliary lanes and allramps as shown in the FEIS design schematic

• Travel modeling was based on 2035 networks so the results could becompared to the FEIS

• Park access as shown in the FEIS would remain the same and could beaugmented by additional access as proposed by others

• Phase 2 of the Trinity Parkway will be included in 2040 network ofMobility 2040 and could not be widen until the 2040 timeframe

3


4/18

Baseline – Alternative

• Prior to evaluating changes in ramping, a 4-lane Trinity Parkway wasmodeled

• Vehicle Miles Traveled (VMT) decreased by almost 22% from the6-lane FEIS design*

• Estimated cost reduction: $203 million (14%)

* VMT relates directly to revenue

4


5/18

Inventory of Cross Street

Ramps & Group in

“Married” Pairs

Evaluate Cross Street Ramps

Based on Weighted Criteria:

• Volume (2035) - 50%• Costs - 25%• Visual Impacts - 25%

Process for

Evaluating

Ramping

Analysis Ramping at North &

South Ends (SH 183 / IH 35E &

IH 45 / SH 310 Interchanges)

Reduce Number of Ramps to

Cross Streets & Evaluate

Traffic Impacts

Travel Demand Runs

• All ramps (14 pairs) (Alternative 1)• No ramps (Alternative 2)• Top 7 ramp pairs (Alternative 3)• Top 4 ramp pairs (Alternative 4)

=

=

=

Travel Demand Run

• Alternative 5=

5


6/18

Results of Cross Street Ramp Analysis

Alternative 3• Included 7 pairs of ramps (top ranking/scoring

cross street ramps in order):

1. Inwood / Hampton Rd. – NB Entrance and SB Exit

2. Riverfront Blvd. / Corinth St. – NB Exit and SB Entrance

3. Sylvan Ave / Wycliff – NB Exit and SB Entrance

4. Lamar Blvd. – NB entrance and SB Exit

5. Houston / Memorial – NB entrance, SB exit

6. Commonwealth Dr. / Irving Blvd – NB exit and SB

entrance

7. Woodall Rogers Freeway – NB entrance and SB Exit

• Estimated cost reduction: $276 million (19%)*• VMT decreased by 22% from the 6-lane FEIS

design

Alternative 4• Included 4 pairs of ramps (top ranking/scoring

cross street ramps in order):

1. Inwood / Hampton Rd. – NB Entrance and SB Exit

2. Riverfront Blvd. / Corinth St. – NB Exit and SB Entrance

3. Sylvan Ave / Wycliff – NB Exit and SB Entrance

4. Lamar Blvd. – NB entrance and SB Exit

• Estimated cost reduction: $336 million (23%)*

• VMT decreased by 25% from the 6-lane FEIS design

6

* Cost reductions includes $203 million for reduced mainlanes


7/18

Results of Ramping at Major Interchanges

• No deferment of ramps at IH 45 / SH 310 are recommended

• The recommended configuration for IH 35E / SH 183 interchange:o Direct connection ramps to/from SH 183 mainlanes: Build both 2-lane connections

as shown in the schematic. A more detailed traffic (LOS) analysis to ensure no

bottlenecks would occur.

o Connections to/from the SH 183 managed lanes: Do not build part of Trinity Parkway

Phase 1. The SH 183 Phase 1 design shows the managed lane exits at Carl Road (4

miles west) and Empire Central (4,000 feet west). The future phases of the SH 183

managed lanes should be coordinated with Phase 2 of the Trinity Parkway.

o Direct connection ramps to/from IH 35E: Build both 1-lane connections shown inschematic

• Had a minimal change (0.4% increase) to VMT7


8/18

Observations

• Change from 6-lane to 4-lane facility results in 22% drop in VMT (Alternative 1)• Even with no ramps to local cross streets (Alternative 2), traffic volumes indicate that the

Trinity Parkway is still warranted because the parkway is a reliever facility

• The number of cross street ramps do not significantly affect VMT; therefore, there couldbe fewer cross street ramps constructed in Phase 1

• Some ramping to local streets is needed to allow egress in the event of an incident

• Elimination of SH 183 managed lanes connections does not significantly affect VMT

• Drivers are using IH 35E to access the Medical District not the Trinity Parkway (thisimpacts current proposals of ramps locations)

• There should be 4 pairs or less of ramps to cross streets

8


9/18

Recommendations

Create an Alternative 4B with:• 4-lane Trinity Parkway

• Include ramp pair at Lamar Blvd.

• Include 3 pairs of ramps west of IH 45:o Inwood / Hampton Rd. – NB Entrance and SB Exito Riverfront Blvd. / Corinth St. – NB Exit and SB Entranceo Sylvan Ave / Wycliff – NB Exit and SB Entrance

• Include access ramps to/from SH 183 mainlanes, IH 35E, and IH 45

• Defer access ramps to/from SH 183 managed lanes• Potential cost savings: $336 million (23%)

9


10/18

Backup Data

10


11/18

Trinity Parkway Alternative Access Evaluation1/18/2016

FEIS Alt 1 Alt 2 Alt 3 Alt 4 Alt 5Number of Lanes 6 4 4 4 4 4Speed (mph) 55 55 55 55 55 55Number of Local Ramp Pairs 14 14 0 7 4 7Number of Access Connections at SH 183/IH 35E 6 6 6 6 6 4Costs

1

Estimated Project Costs (millions) $1,461 $1,258 $1,089 $1,185 $1,125 $1,145Potential Cost Savings (millions) $0 $203 $372 $276 $336 $316Change in Project Costs from the FEIS 0.0% -13.9% -25.4% -18.9% -23.0% -21.6%VMT

Corridor VMT (daily, 2035) 828,305 646,815 588,208 646,134 617,898 648,425Change in VMT from FEIS 0.0% -21.9% -29.0% -22.0% -25.4% -21.7%Performance

Cost Benefit (Dallas County) 4.14 4.13 4.19 4.36 4.50 4.51Cost Benefit (12-county MPA) 4.74 2.95 2.84 3.14 3.24 3.26Ratio of Cost Reduction and Change in VMT4 na 0.63 0.88 0.86 0.91 1.00

Sensitivity AnalysisChange in VMT due to reduction to 4 lanes -21.9%Change in VMT if all local ramps are removed -9.1%Change in VMT if connections to SH 183 managedlanes are deferred

0.4%

11

Notes

1. All costs based on 2013 costs shown in FEIS.

2. Reduction in cost of mainlanes from Commonwealth to Lamar.

3. Reduction in cost at SH 183/IH 35E interchange and local ramps along the parkway.

4. The best alternative is determined by dividing the percentage reduction in cost divided by the percentage reduction in VMT; the largest result is the best alternative.


12/18

1.3

3.30.1

4.4

6-Lane Parkway (FEIS)Access: per FEIS and schematic

Speed: 55 mph

= 2035 Average weekday volumes/per thousand

IH 35E

SH 183

US 175IH 35E

IH 35E

Commonwealth

Commerce

Hampton/

Inwood

Sylvan

IH 45Jefferson

Corinth

MLK

Lamar

159.0

285.3

135.5

144.7

120.6

2.8

6.4

11.4

12.8

0.0

3.60.0

2.7

7.4

5.0

10.81.1 9.711.4

126.6

104.4

1.410.1

98.5

128.1

122.4

168.9

35.5

19.9

18.7

80.5

5.1

4.0

29.9

WoodallIH 30

DNT

316.7

249.8

57.3

20.2

18.8

47.5

49.0 303.4

185.9

160.0

375.2 205.0

217.9

319.1

100.5

338.8

Houston

5.9

5.9

2.4

9.8

14.20.0

0.0

3.4

12


13/18

Parkway Ramp Evaluation Ranking

= Ramp Pair Ranking

IH 35E

SH 183

US 175IH 35E

IH 35E

Commonwealth

Commerce

Hampton/

Inwood

Sylvan

IH 45Jefferson

Corinth

Cedar Crest/

MLKLamar

Woodall

IH 30

DNT

160.0

319.1

Houston

1

5

6

7

8

9

10

11

12

13

3

4

2

14

13

X

Note: The Dallas Dream Team recommended

ramp pairs 9 and 10 highlighted in yellow


14/18

0.9

3.40.1

3.5

IH 35E

SH 183

US 175IH 35E

IH 35E

Commonwealth

Commerce

Hampton/

Inwood

Sylvan

IH 45Jefferson –

Memorial

Corinth

Cedar Crest/

MLKLamar

89.3

10.3

11.2

2.70.0

1.8

6.9

4.5

7.70.72 7.06.8

81.5

0.86.0

98.2

2.6

1.8

Woodall

IH 30

DNT

6.3

11.80.0

0.0

1.9

Access Alternative 1Number of Lanes: 4

Cross Street Access: 14 ramp pairs at Commonwealth, Inwood/Hampton, Sylvan,

Continental, Woodall Rodgers, Jefferson-Memorial, Riverfront/Corinth,

Cedar Crest/MLK, and Lamar

Speed: 55 mph

= 2035 Average weekday volumes per thousand

= Ramp Pair Ranking

1.7

3.2

1.9

0.002

0.08

1.8

14

147.8

305.4

108.8

110.7

96.1

81.5

80.0

104.1

161.9

38.3

17.6

16.7

68.5

34.2

317.2

257.9

56.8

16.7

14.5

38.3

39.3

182.9

145.3

380.1 223.0

207.0

294.5

101.9

332.1

1

5

6

7

8

9

10

11 12

13

3

4

2

14

X


15/18

IH 35E

SH 183

US 175IH 35E

IH 35E

Commonwealth

Commerce

Hampton/

Inwood

Sylvan

IH 45Jefferson –Memorial

Corinth

Cedar Crest/

MLKLamar

81.3

81.3

Woodall

IH 30

DNT


Cross Street Access: 0 ramp pairs (only access at SH 183/IH 35E and IH 45)

Speed: 55 mph


= Ramp Pair Ranking

81.3

81.3

15

160.6

294.6

81.3

81.3

81.3

81.3

160.2

41.6

16.2

16.2

48.9

40.0

333.1

243.9

60.0

12.7

13.3

27.9

27.3

191.1

144.1

390.9 227.8

211.1

308.2.1

101.3

336.3

81.3

X


16/18

IH 35E

SH 183

US 175IH 35E

IH 35E

Commonwealth

Commerce

Hampton/

Inwood

Sylvan


Corinth

Cedar Crest /

MLKLamar

88.5

0.08

1.9

11.2

11.7

6.9

3.9

9.7

82.2

7.4

100.0

2.1

1.4

Woodall

IH 30

DNT

9.7

13.8


Cross Street Access: 7 ramp pairs - Commonwealth, Inwood/Hampton, Sylvan,

Woodall Rodgers, Jefferson-Memorial, Corinth, and Lamar

Speed: 55 mph


= Ramp Pair Ranking

3.8

1.8

16

148.1

305.2

109.3

111.3

99.3

82.2

76.5

100.0

160.9

38.7

17.5

16.4

66.0

35.0

316.9

246.1

56.4

16.1

15.0

38.9

39.4

183.8

144.8

378.7 223.8

212.3

310.6

101.9

330.6

1

5

6

7

3

4

2

X


17/18

IH 35E

SH 183

US 175IH 35E

IH 35E

Commonwealth

Commerce

Hampton/

Inwood

Sylvan


Corinth

Cedar Crest /

MLKLamar

76.7

12.7

11.9

2.7

1.8

81.2

102.6

2.6

1.5

Woodall

IH 30

DNT

9.0

12.4


Cross Street Access: 4 pairs of ramps - Inwood/Hampton, Sylvan, Corinth, and Lamar

Speed: 55 mph


= Ramp Pair Ranking

17

147.0

301.8

101.3

101.3

81.2

81.2

81.2

102.6

161.7

38.7

17.9

16.9

67.8

34.7

321.5

241.0

57.5

16.8

16.5

34.6

33.3

183.4

145.6

379.0 223.8

212.0

308.9

102.2

335.0

1 3

4

2

X

NCTCOG Staff Recommendation

• Include 3 pairs of ramps west of IH 45 plus ramps atLamar (4 pairs total)

• Eliminate access to/from SH 183 managed lanes• Provides lane balance at SH 183 and IH 35E• Probable benefit ratio greater than 1

Note: The Dallas Dream Team recommended

ramp pairs 10 and 12

Ramp pairs 9 and 10 vs. 1, 2, 3, (4)

3 > 10

2 > 12

Plus 1


18/18

IH 35E

SH 183

US 175IH 35E

IH 35E

Commonwealth

Commerce

Hampton/

Inwood

Sylvan


Corinth

Cedar Crest /

MLKLamar

89.3

0.1

2.5

10.9

12.8

6.9

3.6

9.6

82.2

8.0

99.7

2.2

1.4

Woodall

IH 30

DNT

9.7

13.7


Cross Street Access: 7 ramp pairs - Commonwealth, Inwood/Hampton, Sylvan,

Woodall Rodgers, Jefferson-Memorial, Corinth, and Lamar

Eliminated direct connections to/from SH 183 tolled managed lanes

Speed: 55 mph


= Ramp Pair Ranking

3.9

2.0

18

148.8

305.8

110.5

113.1

99.8

82.1

76.3

99.7

160.9

38.9

17.5

16.3

65.9

35.0

316.6

246.6

56.6

16.1

16.1

38.3

40.0

184.0

144.7

380.1 223.8

211.8

310.7

101.7

330.9

1

5

6

7

3

4

2

X

Date post:	07-Jul-2018
Category:	Documents
Upload:	brandonformby
View:	220 times
Download:	0 times

Trinity Parkway Alt Ramp Analysis _01!21!2016

Documents