At locations where recommended speed zones will be 5 miles per hour or more below the 85th percentile speed because of high crash experience, the crashes for the most recent calendar year available should be shown on the strip map. RI-1 Sheets will facilitate accurate plotting of crashes, since crash locations are coded from these sheets.

When districts submit strip maps or prints to the Traffic Operations Division (TRF) for review, TRF will obtain the crash rate for the roadway section in question as well as the statewide average crash rate for the appropriate type of roadway section and add these data to the strip map. Crash rates will be considered before lowering the zone. These data will be an important consideration in determining whether the lower zoning is justified.

Crash data need not be plotted on the strip map when proposed speed zones are within 5 miles per hour of the 85th percentile speed checks.