Speed limit recommendation in vicinity of signalized, high-speed intersection.

Details

• Creators:
  Sharma, Anuj ; Wu, Zifeng ; Wang, Shefang ; Rilett, Laurence R.
• Corporate Creators:
  Nebraska Transportation Center
• Corporate Contributors:
  Nebraska. Dept. of Roads ; United States. Federal Highway Administration ; United States. Department of Transportation. Federal Transit Administration
• Subject/TRT Terms:
  • Speed limits
  • Signalized intersections
  • Intersections
  • Traffic regulations
  • Speed zones Speed limits
  • Signalized intersections
  • Intersections
  • Traffic regulations
  • Speed zones
• Publication/ Report Number:
  SPR-P1 (11) M307
• Resource Type:
  Tech Report
• Geographical Coverage:
  Nebraska
• Edition:
  Final report.
• Corporate Publisher:
  Nebraska Transportation Center
• Abstract:
  We evaluated the traffic operations and safety effects of 5 mph and 10 mph speed limit reductions in the vicinity of highspeed, ; signalized intersections with advance warning flashers (AWF). Traffic operational effects of the reduced speed ; limits were analyzed for seven high-speed, signalized intersections with AWF using the Quantile regression model and ; Seemingly Unrelated Regression Estimation (SURE). Change of speed limit from 60 mph to 55 mph did not lead to any ; statistically significant reduction in 15th, 50th, or 85th percentile. The reduction from 65 mph to 55 mph hour led to a 4.6 ; mph reduction in 85th percentile speed; also, the speed dispersion based on inter-percentile range between 15th and 85th ; percentiles was reduced by 1.8 mph. About the mean and standard deviation of speed estimated by SURE, the only ; statistically significant impact is from the speed limit reduction of 10 mph from 65 mph, which reduced the mean speed of ; vehicles by 3.8 mph at the significance level of 95%. In the safety effect study, a crash analysis based on 56 approaches ; from 28 intersections was performed. The 10 mph speed limit reduction from 65 to 55 mph was found to reduce, on an ; average, 0.4 crashes per approach per year with 90% percent level of confidence while the 5 mph reductions in the dataset ; was found to reduce, on an average, 0.6 crashes per approach per year with 95% significance level. Also, the studied ; approaches with 10 mph reduction were found to have a lower probability of possible injury crashes and a higher ; probability of property damage crashes with a 90% level of confidence. The 5 mph reductions in this dataset did not show ; any significant effect on reducing crash severity. It was also found that lower speed limits in vicinity of the signalized ; intersection reduced the probability of fatal and injury crashes.
  More +
• Format:
  PDF
• Download URL:
  https://rosap.ntl.bts.gov/view/dot/24748/dot_24748_DS1.pdf
• File Type:
  [PDF - 3.90 MB]
• Collection(s):
  US Transportation Collection
• Main Document Checksum:
  urn:sha-512:a7cbe07ad58d4cc87438f0637f1982b9d983a833cdca4fc726560febdb4478b5bfdcb1a7b16922d5709d9d59d4f1ca4489223af9d2ce17a3ac0fe0f97a5af2aa