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Comparative Traffic Study Morrisville-Carpenter Road versus Crabtree Crossing Extension. Presentation to: Morrisville Town Council Prepared by: Parsons Brinckerhoff May 8, 2006. Study Area. Analysis & Conclusions. Analysis developed to compare two projects - PowerPoint PPT Presentation
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Comparative Traffic StudyMorrisville-Carpenter Road versus
Crabtree Crossing Extension
Presentation to: Morrisville Town Council
Prepared by: Parsons Brinckerhoff
May 8, 2006
Study Area
Analysis & Conclusions
Analysis developed to compare two projects 4 roadway scenarios investigated – No Build, Widen M-C
Road only, Crabtree Crossing Only, Build Both Projects 2008 AM and PM peaks were investigated due to differing
traffic patterns and to focus on operations in relative near term Combination of intersection analysis, arterial analysis, and
network efficiency analysis were conducted.
For each of these analyses, two primary conclusions: Widen M-C Road better in PM, Crabtree Crossing better in
AM NC 54 at M-C Road is critical intersection and severely
congested
Crabtree Crossing RoadAdvantages Performs better in AM
MC Road NC 54 signal Network efficiency
Improves Roadway Connectivity Diverts Traffic from NC 54
Disadvantages Requires left turn to be added on
Morrisville-Carpenter Road Performance improvement results
from diversion (less reliable since I-40 diversion to NC 54 could occur)
More expensive (approx. $8.5 million not including E Street)
Other Issues Four leg intersection requires
signal at Town Hall Drive E Street or Carolina Avenue not
required
Widen Morrisville-Carpenter RdAdvantages Performs better in PM
MC Road NC 54 signal Network efficiency
Performs better during non-peak Serves more traffic (18,000 vpd vs.
6,500 vpd) Reduces neighborhood cut-thru traffic Shorter eastbound queue Serves more local east-west traffic Signal not required at Town Hall Less expensive Median improves safety at Church St
Disadvantages Requires connection to Franklin-
Upchurch Rd due to median Median restricts access at Church
Street
Other Issues Less expensive (approx. $7.3 million
including E Street) Median requires E Street or Carolina
Avenue Fire Station can operate during &
after construction (if TTA not built) Potential NCDOT project in very
long term
CONCLUSION: WIDEN MORRISVILLE-CARPENTER ROAD FIRST
NC 54 Intersection Operations
Improvement Average Delay per Vehicle Comments
AM PM
No Build LOS F
108.8 s
LOS F
166.2 s
Widen Morrisville-Carpenter Road Only
LOS F
86.0 s
(20% less)
LOS F
105.3 s
(37% less)
Build First, improvements on two of four approaches,
$7.3 M with E Street
Build Crabtree Crossing Only LOS E
63.7 s
(41% less)
LOS F
117.0 s
(30% less)
Depends on NC 54 diversion, $8.5 M
Build Both LOS E
55.0 s
(50% less)
LOS F
83.6 s
(50% less)
Total $15.8 M with E Street
How Can NC 54 Intersection be Improved? EXPANDED ANALYSIS - PRELIMINARY Even with the widening of Morrisville-Carpenter Road, LOS F operations can be expected at the NC 54/ M-C Road intersection Therefore, wanted to investigate if additional widening could be done at the NC 54 intersection as part of widening
ADDITIONAL IMPROVEMENTS TO CONSIDER NC 54 northbound – Add right turn and lengthen left turn bay, approx. $600,000 plus ROW Convert new M-C eastbound right turn to shared thru-right, requires widening east of intersection, non-standard rail gates, approx. $900,000 with short extension
PRELIMINARY FINDINGS Improvements reduced delays in AM but reduced impact in PM Impacts would include at least three relocations, including historical structures. There is potential for additional intersection improvements being effective. Additional simulation analysis with new traffic counts would be needed, however. In addition, impacts would need reviewed.
NC 54 Intersection Improvements - PRELIMINARY
Improvement Delay Reduction Comments
AM PM
Widen Morrisville-Carpenter Road Only
Add EB right 15.2% 24.7% Best improvement AM & PM
Add SB right 1.4% 10.8% Needed for RR preemption
Additional Improvements to Consider
Historical home & others impacted
Add NB right / extend NB left 15.7% 0.4%
(NB NC 54 improves 15%, EB MC Road improves 10% )
Primary impact in AM, NB left is causing queues in thru lanes
Convert EB right to thru/right 4.1% 0.5% Minimal impact in PM, reduces AM eastbound queue
Long Term Improvements
Add WB thru 7.5% 11.1% Requires 2nd WB lane over tracks, RR approval unlikely
Widen NC 54 12.0% 18.8% Very expensive, not identified as long term project
Comparison of Crabtree Crossing vs. Additional
Improvements - PRELIMINARY Improvement Average Delay per Vehicle Comments
AM PM
No Build 108.8 s 166.2 s
Widen Morrisville-Carpenter Road Only ($5.8 M)
86.0 s
(20% less than NB)
105.3 s (37% less than NB)
Build First
Possible Second Project
Build M-C Road & Crabtree Crossing
($8.5 M)
55.0 s
(50% less)
83.6 s
(50% less)
More congestion relief, more expensive, based on assumed diversion
Widen M-C Road & Additional Improvements ($1.5 M plus ROW)
66.2 s
(39% less)
104.0 s (38% less)
AM relief but minimal PM relief, historic home & others impacted, less congestion relief, less expensive
Impact of Additional Improvements -
PRELIMINARY Including the additional improvements reduces AM delays an additional 20% but has little impact in the PM peak. (Note: Simulation indicates PM peak delays are reduced 10% - 15% for NC 54 northbound and M-C Road eastbound.) Improvements do not significantly reduce eastbound queues in downtown, but do reduce queues on NC 54 northbound (in both AM and PM peak). Additional improvements would require:
Up to 3 relocations along NC 54 (including historical structures)Stream crossing requiring special permits on Aviation Parkway
Conceptual cost approx. $1.5 M plus ROW Overlaps NCDOT project U-3343.
Conclusion: There is potential for additional intersection improvements being effective. Additional simulation analysis would be needed, however. Note: Traffic analysis based on adjusted 2003 traffic counts. More detailed analysis to focus on intersection details would benefit from new traffic counts.