Safety Analysis and Crash Modification Factors of an Adaptive Signal Control Technology along a Corridor

Osorio, Jesus J.; Benekohal, Rahim F.; University of Illinois at Urbana-Champaign. Dept. of Civil and Environmental Engineering; Illinois Center for Transportation

Advanced Search

Select up to three search categories and corresponding keywords using the fields to the right. Refer to the Help section for more detailed instructions.

Search our Collections & Repository

Advanced Search
Custom Query

All these words:

For very narrow results

This exact word or phrase:

When looking for a specific result

Any of these words:

Best used for discovery & interchangable words

None of these words:

Recommended to be used in conjunction with other fields

Language:

Dates

Publication Date Range:

to

Document Data

Title:

Document Type:

Library

Collection:

Series:

People

Author:

Clear All

Query Builder

Query box

Clear All

For additional assistance using the Custom Query please check out our Help Page

i

Safety Analysis and Crash Modification Factors of an Adaptive Signal Control Technology along a Corridor

2019-01-01
By Osorio, Jesus J. ; Benekohal, Rahim F.

[PDF-1.76 MB]

English

Details You May Also Like

Details:

Creators:

Osorio, Jesus J. ; Benekohal, Rahim F.

Osorio, Jesus J. ; Benekohal, Rahim F. Less -
Corporate Creators:

University of Illinois at Urbana-Champaign. Dept. of Civil and Environmental Engineering ; Illinois Center for Transportation

University of Illinois at Urbana-Champaign. Dept. of Civil and Environmental Engineering ; Illinois Center for Transportation Less -
Corporate Contributors:

Illinois. Department of Transportation ; United States. Department of Transportation ; United States. Federal Highway Administration

Illinois. Department of Transportation ; United States. Department of Transportation ; United States. Federal Highway Administration Less -
Subject/TRT Terms:

[+]

Adaptive Control Adaptive Signal Control Technology Bayes' Theorem Before And After Studies Calibration Crash Modification Factor Crash Modification Factors Crash Rates Crash Severity Highway Safety Manual Safety Performance Functions SynchroGreen Traffic Signal Control Systems
Publication/ Report Number:

FHWA-ICT-19-001
Resource Type:

Tech Report
Geographical Coverage:

Illinois ; United States

Illinois ; United States Less -
Edition:

Safety Report, 1/1/13 – 12/1/18
Corporate Publisher:

Illinois Center for Transportation
Abstract:

The main objective of this study is to determine the safety effectiveness of the adaptive signal control technology (ASCT) SynchroGreen using an observational before and after study applying the Empirical Bayes (EB) method. Both national (HSM) and state specific (Illinois) safety performance functions (SPF) were selected and calibrated for the local conditions. A total of 14 SPFs from the HSM and 3 additional from Illinois were calibrated and crash modification factors (CMF) were developed. For multiple-vehicle fatal and injury (FI) crashes at all intersections (four-legged and three-legged combined), the CMF was 0.67, which was not statistically significant at 95 percent confidence level (it was significant at 87 percent). For four-legged-only intersections the CMF was 0.67 as well, which was not significant with 95 percent confidence (it was significant at 85 percent). The 87 and 85 percent are not confidence levels used in practice, however they clearly indicate a decreasing trend in FI crashes due to the implementation of ASCT. For PDO and total crashes, all CMF computed were very close to one indicating no crash reduction due to the implementation of ASCT. The CMF for Illinois KAB crashes (fatal, type A injury, and type B injury crashes combined) was found to be 0.68, which was not significant at 95 percent confidence level (it was significant at 71 percent indicating a decreasing trend in these types of crashes). Paired t-test results showed no reduction in sideswipe same direction, turning, and type B injury crashes. However, angle, rear end, type A and type C injury crashes showed slight decreases that were not significant.
Format:

PDF
Funding:

R27-127
Collection(s):

US Transportation Collection
Main Document Checksum:

[+]

urn:sha256:1fc492f53125fb870a208b75798abe84b18235528c94a0d916e726cc42a4abe4
Download URL:

https://rosap.ntl.bts.gov/view/dot/41710/dot_41710_DS1.pdf
File Type:

No Additional Files

More +

Safety Analysis and Crash Modification Factors of an Adaptive Signal Control Technology along a Corridor

Details:

Supporting Files

You May Also Like