I-64 Peninsula Shoulder Usage Evaluation. Eric Stringfield VDOT Hampton Roads Transportation Planning April 3, 2013

Transcription

1 I-64 Peninsula Shoulder Usage Evaluation Eric Stringfield VDOT Hampton Roads Transportation Planning April 3, 2013

2 Briefing Purpose Evaluation Area / Existing Conditions Code and Policy Engineering Facts Constraints Next Steps 2

3 Study Evaluation Area MM248 MM255 3

4 Evaluation Area Jefferson Ave (Rte 143) to Ft. Eustis Blvd (Rte 105) 4

5 I-64 Existing Conditions Travel Lanes 12 Lanes Pavement Design 9 Reinforced Concrete Surface 4 Base Shoulders 8 Inside Shoulder (3 Paved) 15 Outside Shoulder (10 Paved) Pavement Design 3 Asphalt 4 and Variable Base Under-drains Installed 1 From Edge Line Of Travel Lane 5

6 I-64 Existing Conditions Jefferson Ave (Rte 143) to Ft. Eustis Blvd (Rte 105) ADT 87,900 Split 50/50 Weekday Peak Hour EB WB AM 3,902 3,694 PM 3,429 3,531 Summer Weekend Peak Hour 4,220 VPH Capacity Issues Weekday Peaks and Weekends 6

7 Summary of Safety Analysis WB Jefferson (Collector Distributor Area) Region Rear End Rate Sideswipe Rate Fixed Object Rate EPDO Rate WB Lane Reduction (2 Lane Section) Region Rear End Rate Sideswipe Rate Fixed Object Rate EPDO Rate WB Fort Eustis (Exit Ramp) Region Rear End Rate Sideswipe Rate Fixed Object Rate EPDO Rate EB Fort Eustis (On Ramp) Region Rear End Rate Sideswipe Rate Fixed Object Rate EPDO Rate Incident rates expressed in units of incidents/million vehicle-miles traveled EPDO rate expressed in units of equivalent property-damage only incidents/million vehicle-miles traveled Regional incident rates are the average rate for interstate facilities in VDOT Hampton Roads District Regional EPDO rate taken from Hampton Roads Regional Safety Study: General Crash Data & Trends 2010 Update prepared by HRTPO 7

8 8 Existing Conditions I-64 Video

9 Code / Policy VDOT is guided by Stewardship and Oversight Agreement and latest legislation Moving Ahead for Progress 21 st Century ( MAP 21) as an agent of FHWA American Association of State highway and Transportation Officials (AASHTO) Policy Current Standard FHWA s adopted standard for projects on the National Highway System (NHS) (regardless of funding) for new or reconstruction Design Exception FHWA Policy Title 23 9 Code of Federal Regulations Part 625- Design Standards for Highways Application (f) Exceptions (1) Approval may be given on a project basis to designs which do not conform to minimum criteria for (i) Experimental features on projects; and (ii) Projects where conditions warrant that exceptions be made

10 Shoulder Width Design Standards Outside Shoulder Paved width shall not be less than 10 feet Where truck traffic exceeds 250 Directional Design Hourly Volume (DDHV) 12 ft Inside Shoulder Paved width shall be at least 4 feet Six or more lanes 10 foot paved width Where truck traffic exceeds 250 DDHV 12 ft Source: AASHTO Policy on Design Standards Interstate System 10

11 Engineering Facts Travel Time 1/4 mile upstream of Jefferson Ave Off-Ramp to 1/4 mile after Final Lane Drop with Shoulder Lane Existing Condition Free Flow Travel Time based on 70 mph 500 Travel Time (second) :00 PM 2:15 PM 2:30 PM 2:45 PM 3:00 PM 3:15 PM 3:30 PM 3:45 PM 4:00 PM 4:15 PM 4:30 PM 4:45 PM 5:00 PM 5:15 PM 5:30 PM 5:45 PM Time (Friday, Sep 28, 2012) 11

12 Engineering Facts Existing Condition Average Queue Average Queue with Shoulder Lane Queue Length Queue Length from HOV Lane End Point Queue Length from HOV End Point (feet) :00 PM 2:15 PM 2:30 PM 2:45 PM 3:00 PM 3:15 PM 3:30 PM 3:45 PM 4:00 PM 4:15 PM 4:30 PM 4:45 PM 5:00 PM 5:15 PM 5:30 PM 5:45 PM Time (Friday, Sep 28, 2012) 12

13 70 Engineering Facts I-64 WB Average Speed under Jefferson Ave Bridge (MP 255.2) Existing Condition with Shoulder Lane Speed (mph) :00 PM 2:15 PM 2:30 PM 2:45 PM 3:00 PM 3:15 PM 3:30 PM 3:45 PM 4:00 PM 4:15 PM 4:30 PM 4:45 PM 5:00 PM 5:15 PM 5:30 PM 5:45 PM Time (Friday, Sep 28, 2012) 13

14 Engineering Facts 70 Existing Condition with Shoulder Lane I-64 WB Average Speed before HOV Lane Ends (MP 254.6) Speed (mph) :00 PM 2:15 PM 2:30 PM 2:45 PM 3:00 PM 3:15 PM 3:30 PM 3:45 PM 4:00 PM 4:15 PM 4:30 PM 4:45 PM 5:00 PM 5:15 PM 5:30 PM 5:45 PM Time (Friday, Sep 28, 2012) 14

15 Engineering Facts 70 I-64 WB Average Speed before Jefferson Ave On-Ramp (MP 254.4) Existing Condition with Shoulder Lane Speed (mph) :00 PM 2:15 PM 2:30 PM 2:45 PM 3:00 PM 3:15 PM 3:30 PM 3:45 PM 4:00 PM 4:15 PM 4:30 PM 4:45 PM 5:00 PM 5:15 PM 5:30 PM 5:45 PM Time (Friday, Sep 28, 2012) 15

16 Engineering Facts 70 Existing Condition with Shoulder Lane I-64 WB Average Speed under Bland Blvd (MP 254.1) Speed (mph) :00 PM 2:15 PM 2:30 PM 2:45 PM 3:00 PM 3:15 PM 3:30 PM 3:45 PM 4:00 PM 4:15 PM 4:30 PM 4:45 PM 5:00 PM 5:15 PM 5:30 PM 5:45 PM Time (Friday, Sep 28, 2012) 16

17 Engineering Facts 70 I-64 WB Average Speed before Final Left-Side Lane-Drop (MP 253.8) Existing Condition with Shoulder Lane Speed (mph) :00 PM 2:15 PM 2:30 PM 2:45 PM 3:00 PM 3:15 PM 3:30 PM 3:45 PM 4:00 PM 4:15 PM 4:30 PM 4:45 PM 5:00 PM 5:15 PM 5:30 PM 5:45 PM Time (Friday, Sep 28, 2012) 17

18 Engineering Facts 64 I-64 WB Average Speed after Final Left-Side Lane-Drop (MP 253.5) Existing Condition with Shoulder Lane Speed (mph) :00 PM 2:15 PM 2:30 PM 2:45 PM 3:00 PM 3:15 PM 3:30 PM 3:45 PM 4:00 PM 4:15 PM 4:30 PM 4:45 PM 5:00 PM 5:15 PM 5:30 PM 5:45 PM Time (Friday, Sep 28, 2012) 18

19 Engineering Facts Travel Time 4 mile upstream of Jefferson Ave Off-Ramp to 1/4 mile after Final Lane Drop with Shoulder Lane Existing Condition Free Flow Travel Time based on 70 mph 1400 Travel Time (second) Time (Summer Peak - Saturday) 19

20 Existing Condition Average Queue Average Queue with Shoulder Lane Engineering Facts Queue Length Queue Length from the Final Lane- Drop on the Left Side Queue Length from the Final Lane-Drop on teh Left-Side Queue Length (feet) Time (Summer Peak - Saturday) 20

21 Engineering Facts / I-66 Figure 42. Illustration. I-66 HOV/SL Lane Plan View Virginia (50). Figure 41. Photo. I-66 HOV/SL Portion Virginia (50). Figure 43. Illustration. I-66 HOV/SL Typical Cross-Section Virginia (50 Source FHWA - Efficient Use of Highway Capacity Summary Report to Congress 21

22 22 Engineering Facts / I-264

23 Constraints Safety Achieving Current Geometric Standards Design Exceptions Regardless of the difference in language used in the adopted criteria (shall, should be provided, should be considered, etc.) all the shoulder widths described have become standards of the interstate system by virtue of their adoption by FHWA and they are the minimum values for each condition described. Therefore a project designed for the interstate system that does not provide the applicable shoulder widths will require a formal design exception. 23 Procedure for Design Exception District Recommendation (Location and Design Section) Chief Engineer Review/Forwards FWHA Approval

24 Constraints FHWA Policy / Standards Geometric Lane Widths Shoulder Widths Barriers: Bridges, Underpasses Other Existing Infrastructure i.e. guardrail, cantilevers Pavement Design Traffic Operations Signage Shoulder lane operation / exit ramp Maintenance Shoulder Short life cycle 6 months under existing load 24

25 Constraints Weaves Service Interchanges Route 143 Route 60 Signals at Ramp Cost Rehabilitation vs. Reconstruction Right of Way 25

26 Potential Short Term Strategies WB Off-Ramp EB Off-Ramp AM Speed AM Density (LOS) PM Speed PM Density (LOS) AM Speed AM Density (LOS) PM Speed PM Density (LOS) No Build (C) (C) (C) (B) Shoulder (C) (C) (C) (B) No Weave (B) (B) (C) (C) DDI (C) (C) (C) (B) WB Merge EB Merge AM Speed AM Density (LOS) PM Speed PM Density (LOS) AM Speed AM Density (LOS) PM Speed PM Density (LOS) No Build (B) (C) (C) (C) Shoulder (C) (C) (C) (C) No Weave (C) (C) (B) (B) DDI (C) (B) (B) (C) Short Term Strategies No Build Shoulder (3-lane section) Interchange Modification Eliminate weaving segment Diverging Diamond 26

27 Potential Short Term Strategies Best Practices Adequate installation of signage to provide operational efficiency at all times Placement of lane control signal over each travel lane Dynamic message signs for guidance on usage of shoulder as travel lane Comprehensive incident management program Connection to Traffic Operations Center (TOC) Speed harmonization Incident detection Emergency refuge areas or pull-outs beyond shoulder 27

28 Next Steps Coordination with Multi-Discipline Team Internally Determine pavement design that will support existing traffic Evaluation of interchange operation and shoulder lane Coordination with local stakeholders Coordination with Federal Highways Determine if geometric waivers are feasible Cost Benefit Analysis Recommended Improvements must Concur with I-64 EIS Explore Recommended Improvement Strategies Shoulders (Inside or Outside) Interchange Improvements ITS FHWA Approvals and Concurrence 28 Project Development

29 29

30 I-64 Peninsula Shoulder Usage Evaluation VDOT Hampton Roads Transportation Planning April 3, 2013