Texas Transportation Institute Finds BlinkerStop

LED SIGNS REDUCE INTERSECTION BLOW-THROUGHS BY OVER 50 PERCENT!
Two intersections in Texas, one rural and one urban, were studied using a fluorescent red stop sign and a BlinkerStop® flashing red LED (Light-Emitting Diode) stop sign. Stopping-compliance data was collected with a video camera placed near the intersection, yet out of the view of drivers. All data was measured in the daytime, twilight, and nighttime periods both before and after placement of the flashing LED stop sign and again after the placement of the high intensity, fluorescent red stop sign.

STATISTICALLY SIGNIFICANT DIFFERENCE AT 95% LEVEL OF CONFIDENCE
Overall, the use of stop signs with red flashing LEDs embedded at each corner of the sign face had consistent statistically significant beneficial effects on daytime and nighttime stopping compliance. Statistically significant reductions of 34 to 53 percent in the rate of vehicles not-fully stopping (blow-throughs and roll-throughs) were observed during four of the five evaluation periods after installation of the flashing LED stop sign. Overall, the total rate of vehicles not fully stopping was reduced from 0.471 to 0.335 (28.9 percent reduction) after installation of the flashing LED stop sign. The flashing LED stop sign was particularly effective for reducing the rate of vehicles blowing-through the intersection, as the overall rate of occurrence was reduced from 0.051 to 0.024 (52.9 percent).

RECOMMENDATIONS FOR USE OF RED FLASHING LED STOP SIGNS
Due to their effectiveness in reducing stop sign violations, especially blow-throughs, stop signs with red flashing LEDs embedded in the corners are recommended at spot locations where a high percentage of vehicles do not comply with the stop sign. Non-compliance with the stop sign may be especially prevalent at locations where the stop sign is at least partially obstructed or in an otherwise disadvantaged position, such as extreme lateral offset and the stop condition is not reiterated by other features.