Evaluation of Methods to Reduce Speed in Work Zones.

摘要

This study involved an evaluation of the effectiveness of the California Highway Patrol (CHP) combination Radar Detection/Changeable Message Sign (CMS) (CHP-CMS) trailers to manage traffic speeds in highway work zones. The CHP-CMS trailer is a radar-equipped CMS trailer unit outfitted with revolving or flashing lights similar to those used on CHP vehicles. The main objective of this study was to test the following hypothesis: does the CHP-CMS trailer unit provide an effective deterrent to speeding, thereby slowing traffic in the work zones. The results of this study validated this hypothesis with the understanding that the validation was based on limited (a total of three) field tests due to the limited scope and time duration of this study as well as availability of actual work zones for testing. Further testing is recommended in the future. The research developed a repeatable test methodology based on the use of easily deployable speed sensors distributed throughout the work zone. Additional sensors were also used for validation and collection of other pertinent data. Data was also collected on the combined utilization of the CHP-CMS trailer and a CHP vehicle as in MAZEEP (Maintenance Zone Enhanced Enforcement Program) and its effect on traffic speed reduction at work zones. The overall conclusion of this study is that the use of the CHP-CMS system does result in a deterrent to speeding vehicles near work zones and its use can therefore improve work zone safety.