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Evaluation of Innovative Safety Treatments. Volume 6: A Study of the Effectiveness of In-Roadway Lights. Final rept.
| 题名： | Evaluation of Innovative Safety Treatments. Volume 6: A Study of the Effectiveness of In-Roadway Lights. Final rept. |
| 作者： | Reddy-V.; Datta-T.; Pinapaka-S. |
| 关键词： | *Florida-State-Department-of-Transportation; *Innovative-safety-treatments; *In-roadway-lights; *Effectiveness-.;Travel-speeds; Motorist-safety; Speed-data; Crash-data; Evaluation-. |
| 摘要： | The Florida Department of Transportation (FDOT) District 4 Traffic Operations Office installed a series of in-roadway lights in November 2004 along the off-ramp from southbound I-95 to westbound State Road 84 (SR 84), in an effort to reduce travel speeds and improve motorist safety. The exit ramp is relatively long, approximately 2000 feet in length. As such, drivers tend to travel at a relatively high speed even after exiting the interstate. This one-lane ramp operates as a free-flow right-turn-only lane, which then merges with westbound SR 84. The turning radius for this right turn is very small requiring drivers to slow down to 10 miles per hour. A total of 41 crashes occurred at this intersection during the three-year period from 2001 to 2003. It appears that some southbound drivers on the ramp approach this intersection at a high rate of speed, often misjudge the ramp geometry, miss the merge lane due to the wide turn associated with excessive speed and encroach into the path of oncoming westbound traffic on SR 84. The in-roadway lights were installed to alert motorists of the approaching sharp right turn at SR 84, so that drivers would reduce their speed in order to negotiate the right turn safely. The in-roadway lights were linked with a speed detection system, which would detect the speed of the approaching vehicle and activate the in-roadway lights when the detected speed is above the pre-set speed of 50 miles per hour (mph). |
| 报告类型： | 科技报告 |
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