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Section 6: Approach Speeds

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The 85th percentile speed on each of the approaches to the location should be determined. (See the TxDOT manual Procedures for Establishing Speed Zones for information on determining the 85th percentile speed.) Where approaches are controlled by a STOP sign or traffic signal at the time of the study, the speed check must be conducted far enough away from the location to obtain a speed not affected by the sign or signal.

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Special Situations

At locations where a statewide statutory speed limit (70 mph) has been lowered, either by Transportation Commission minute order or city ordinance, the lowered speed limit may be acceptable as the approach speed.

At locations under construction, estimated approach speeds are acceptable.

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