SPD-HARM: Current Research,
cont.
25
2009 TxDOT Speed
Limit Selection
Algorithm Research
Study
highlights:
•Multi-resolution simulation framework using VISSIM/VISTA
•Modeled segment of Mopac
Expressway in Austin, TX
•Model was successful at
achieving consistent flow harmonization
Findings:
•Achieving speed
harmonization did not translate to increased throughput
•However, was successful at delaying breakdown formation
2010 California PATH Analysis of Combined VSL and Ramp Metering
Study
highlights:
•Assess
ability to defer or avoid traffic flow breakdowns for recurrent congestion at bottleneck locations
by coordinating VSL and ramp metering
•How
to implement the VSL feedback to
the driver (e.g., via VSL signs or
in-vehicle communication) to achieve the best driver response is a further study recommendation
Findings:
•Simulations
achieved a significant reduction of travel delays and improvement in flow