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Traffic Control Devices All -Way Stop Sign Implementation Purpose The All -Way STOP condition is primarily intended to address either a higher than expected intersection crash frequency or to be an interim measure at locations that have demonstrated a need for a traffic signal installation, but where the signal cannot be installed in a reasonable period of time. It is a common belief that installing STOP signs on all approaches of an intersection will result in fewer crashes. Research indicates that average crash frequency at All -Way STOP controlled intersection is 50% higher than thru /STOP intersections. Also, there is no evident to suggest R1 -1 that STOP signs decrease travel speeds. Source: FHWA Manual on Uniform Traffic control Devi( Effects Volumes Little or no effect. Speed Little or no reduction in speed, mid -block speed possibly increase Traffic Noise and Air Little or no effect. Traffic Safety In most cases, the installation of an All -Way STOP will increase the frequency of crashes. Only in those rare cases where the number of crashes with the Thru /STOP control is unusually high, is the forecast of safety improvement probable. Advantages • Inexpensive installation costs (do require continual maintenance costs) • Defines driver's right -of -way • Increase opportunity for pedestrians to cross the roadway • May discourage cut - through traffic Disadvantages • Can cause negative traffic safety impacts if sign is not warranted • May result in mid -block speeding • Increasing levels of intersection control are associated with increased frequency of crashes. • Difficult to enforce full stop control compliance • Could result in increase in speeds between the signs as drivers try to make up for lost time Problems Targeted • Unusual conditions at intersection including crash frequency, turning patterns, delay and pedestrian conflicts. Design • Traffic volumes and crash frequency thresholds need to be met as established in the Minnesota Manual on Uniform Traffic Control Devices. -The most effective deployment of the All -Way STOP condition is at intersections where the volume of traffic on the major and minor roads is approximately equa.