US Hwy 6 Collector-Distributor Ramp Improvement
About This Project
Background
- US Hwy 6 from I-25 west to Perry Street was recently reconstructed (US 6 Bridges project)
- Observed congestion and safety concerns at westbound merge of the collector-distributor (C-D) ramp and mainline US Hwy 6
- Traffic on the C-D often backs up during the afternoon rush hour
- Stop-and-go traffic on the C-D increases the likelihood of traffic crashes
Challenge
- Physical constraints limit the potential for additional downstream capacity on US Hwy 6
- The need to maintain all freeway ramps results in operational complexity along the collector-distributor ramp and mainline
Solution
- Conducted a traffic study to identify potential improvement options
- Calibrated a micro-simulation traffic model to existing conditions and used the model to test improvement scenarios
- It was determined that removal of a portion of the channelizing barrier and lengthening of the merge area would significantly benefit traffic flow
- Modeled the safety impacts of the planned improvement
- The number of vehicle conflicts (and potential crashes) is significantly reduced by virtue of improvements to traffic flow
Outcome
- Stolfus & Associates, Inc. was ultimately tasked with designing the improvement and as of Spring 2019 it is in process of being constructed
- Ultimately, this project is expected to improve safety and mobility for relatively low cost and with very little disruption