Traffic Analysis Update BRAC Integration Committee (BIC ...€¦ · March 14, 2013 ... Latest...

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Traffic  Analysis  Update BRAC Integration Committee  (BIC) Meeting March 19, 2013

Transcript of Traffic Analysis Update BRAC Integration Committee (BIC ...€¦ · March 14, 2013 ... Latest...

Page 1: Traffic Analysis Update BRAC Integration Committee (BIC ...€¦ · March 14, 2013 ... Latest analysis results (January 7, 2013 memo) show ttaeravel tteime sasa gsvings in SSacimTrafficfroom

Traffic Analysis UpdateBRAC Integration Committee (BIC) Meeting

March 19, 2013

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Agenda Original Design Conceptg g p Analysis Tools Traffic Volume Sets North Wood Road Intersection Hybrid Option

  ill C i  C di i Locust Hill Community Coordination Locust Hill Community Concerns Contact Info Contact Info

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D 355

M

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Original Design Concept Add northbound lane on MD 355 from North Wood 

d h f dRoad to north of Cedar Lane Provide “free” right turn movement exiting NNMC at North Wood RoadNorth Wood Road

Provide four (4) through lanes on MD 355 at Cedar Lane signal

Four (4) lanes merge to three (3) lanes north of Cedar Lane

Provides minimum delay and travel times Provides minimum delay and travel times Original concept did not include phases

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D 355

M

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B   t 

D 355

Became part of Phases 1‐3

M

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Phase 4

D 355

M

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Analysis Tools Synchro

Based on formulas in Highway Capacity Manual (HCM) Calculates Level of Service (LOS) and delay E ti ll  t t  i t ti    i l t d l ti Essentially treats intersections as isolated locations

SimTrafficSimTraffic Based on simulation of vehicles traveling through network Results vary with each run  Reports average results of multiple runs Used primarily for travel time data

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Traffic Volume Sets Original BRAC forecasts developed in 2007

Projected traffic volumes following BRAC in 2011 Primary source used for operational analyses (all projects)B t  fl ti   f  t l d d Best reflection of actual demand

SHA conducted new traffic counts in March 2012SHA conducted new traffic counts in March 2012 Actual “on the ground” data following BRAC implementation However, count volumes are “metered” by congestion and 

k work zone Used to supplement original forecasts

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Synchro Analysis Results (PM Peak) With Original BRAC Forecastsg

No Build:             LOS F (167.5 sec/veh) Build Phases 1‐3:  LOS E (60.8 sec/veh) Build Phase 4:  LOS D (52.3 sec/veh)

U i    C Using 2012 Counts No Build: LOS F (98.8 sec/veh) Build Phases 1 3:  LOS D (47 9 sec/veh) Build Phases 1‐3:  LOS D (47.9 sec/veh) Build Phase 4:  LOS D (44.3 sec/veh)

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North Wood Road Intersection Stop‐controlled intersection under pre‐BRAC conditions (excessive delays)

Installed signalized triple right turn in July 2011 per N    ( h d  f BRAC i l i )Navy request (ahead of BRAC implementation)

Long‐term fate of intersection unknownK   i l    l   ith f   i ht Keep signal vs. replace with free right

Transportation Workgroup will decide based on field data from monitoring programg p g

Benefits of Phase 4 influenced by North Wood Road intersection

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Hybrid Option  SHA proposed hybrid option at North Wood Road Would include “free” right and keep signal Goals

R d   d  i  f  MD    hb d Reduce red time for MD 355 northbound Maintain signal to reduce weaving issues for NNMC traffic

Unfortunately, hybrid option not feasible Geometric constraintsW i  i  f  MD    ffi Weaving issues for MD 355 traffic

Operational and safety concerns

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Locust Hill Community Coordination Hired their own traffic consultant Multiple letters and responses

April 26, 2012J l   6   July 26, 2012

September 6, 2012 March 14, 20134, 3

Several meetings on‐site and at SHA March 27, 2012 May 4, 2012 February 8, 2013

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Locust Hill Community Concerns Will Phase 4 provide benefits if signal at North Wood 

dRoad remains? Latest analysis results (January 7, 2013 memo) show travel time savings in SimTraffic from Phase 4t a e t e sa gs S a c o ase 4

Safety of merge point NCHRP Report 707 – “analysis of crash data did not hi hli h     l  f   ”highlight any unusual safety concerns”

Can widening occur south of North Wood Road instead? Widening south of North Wood Road would not provide corridor travel time savings per SimTraffic

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Contact Information:

Traffic Related QuestionsTraffic Related Questions: Mr. Matt Snare, SHA, Data Services Engineering Division (Travel Forecasting)  410‐545‐5646 or Division (Travel Forecasting), 410 545 5646 or [email protected]

Design/Project Related Questions: Ms. Yuqiong Bai, SHA, Community Design Division, 410‐545‐8816, [email protected]