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All-Way Stop Sign Implementation Traffic Control Devices Purpose The All-Way STOP condition is primarily intended to addresseither a higher than expected intersection crash frequency or tobe an interim measure at locations that have demonstrated aneed for a traffic signal installation, but where the signal cannotbe installed in a reasonable period of time.It is a common beliefthat installing STOP signs on all approaches of an intersection willresult in fewer crashes. Research indicates that average crashfrequency at All-Way STOP controlled intersection is 50% higherthan thru/STOP intersections. Also, there is no evidenceto suggestthat STOP signs decrease travel speeds. Source: FHWA Manual on Uniform Traffic Control Devices 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 equal.