Author
Himes, Scott; Frank Gross; Kimberly Eccles; and Bhagwant Persaud
Benefit Summary HTML

The Intersection Conflict Warning Systems (ICWSs) strategy involves installing vehicle detectors, warning signs such as flashing beacons and variable message signs on the major and/or minor approaches of unsignalized intersections to detect and alert motorists about conflicting vehicles on adjacent approaches. This study evaluates ICWSs at four-legged rural two lane stop-controlled intersections. The objective was to estimate the safety effectiveness of this strategy as measured by crash frequency. Geometric, traffic, and crash data of this type of intersections with ICWS installations in Minnesota (MN) (13 intersection installations), Missouri (MO) (14 intersection installations), and North Carolina (NC) (66 intersection installations) were used to conduct the evaluation of their safety effectiveness. The categories of ICWS installations considered for this study included; i) Overhead signs and flashers at the intersection on the major; loop detector on the minor approach, ii) Overhead signs and flashers at the intersection on the minor approach; loop detector on the major approach, iii) Post-mounted signs and flashers in advance of the intersection on the major; loop detector on the minor approach and post-mounted signs and flashers at the intersection on the minor approach; loop detector on the major approach, iv)Locations with a combination of category (i) through category (iii).

Created Date
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Lesson Background HTML

The Intersection Conflict Warning Systems (ICWSs) strategy involves installing vehicle detectors, warning signs such as flashing beacons and variable message signs on the major and/or minor approaches of unsignalized intersections to detect and alert motorists about conflicting vehicles on adjacent approaches. This study evaluates ICWSs at four-legged rural two lane stop-controlled intersections. The objective was to estimate the safety effectiveness of this strategy as measured by crash frequency. Geometric, traffic, and crash data of this type of intersections with ICWS installations in Minnesota (MN) (13 intersection installations), Missouri (MO) (14 intersection installations), and North Carolina (NC) (66 intersection installations) were used to conduct the evaluation of their safety effectiveness. The categories of ICWS installations considered for this study included; i) Overhead signs and flashers at the intersection on the major; loop detector on the minor approach, ii) Overhead signs and flashers at the intersection on the minor approach; loop detector on the major approach, iii) Post-mounted signs and flashers in advance of the intersection on the major; loop detector on the minor approach and post-mounted signs and flashers at the intersection on the minor approach; loop detector on the major approach, iv)Locations with a combination of category (i) through category (iii).

Publication Sort Date
Publisher
Performed by VHB for U.S. DOT Federal Highway Administration
Result Type
Title
Safety Evaluation of Intersection Conflict Warning Systems
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