Convert Low-Volume Intersections from Two-Way Stop Control to All-Way Stop Control

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DEFINITION AND DESCRIPTION

All-way stop control (AWSC) is implemented by placing stop signs on each leg of an intersection. It is a quick, cost-effective method for alleviating crash problems at intersections with high-severity impact crashes. North Carolina DOT converted 50 intersections from two-way stop control (TWSC) to AWSC and saw a 77% reduction in fatal and injury crashes at the treated intersections. 

Implementation Categories

CONSIDERATIONS

• In general, when the AADT of each road is ≤ 4,000, the intersection with AWSC is expected to operate at an acceptable level of service (NC DOT).
• Consider including a NEW plaque (W16-15P) during the initial implementation.
• Consider installing advanced Stop Ahead signs or pavement messages.
• Conduct public outreach to let users know changes in traffic control are forthcoming.

APPLICATION

• Evaluate current AADT, intersection control, sight distance, and crash history to identify locations where AWSC would be appropriate.  Consult Section 2B.12 of the MUTCD, 11^ᵗʰ Edition for more information.

example

https://deldot.gov/Programs/DSHSP/pdfs/Emphasis-Areas/intersections/AWSC%20Research%20Memo%20with%20Appendices.pdf

Complementary SSA Strategies

• Enhanced Signing
• Speed Reduction Markings
• Supplemental In-Lane Pavement Markings