Speed and travel time data may be useful for corridor planning projects to determine areas of bottlenecks. Give additional attention to bottlenecks to determine different types of mitigations that may relieve congestion. Mitigations might include widening the roadway or adding intersection capacity by adjusting signal timing or providing turn lanes.

Another MOE of interest for corridors is travel time reliability. Travel time reliability helps measure the extent of unexpected delay. Most drivers traveling during peak hours expect some amount of delay. An expected delay is typically accounted for and drivers often adjust their schedules accordingly to get to where they are going on time. The frequency and extent of unexpected delays cause driver’s greater frustration. Travel time reliability is the consistency or dependability in travel times, as measured from day to day and/or across different times of day.

TxDOT has subscriptions with vendors that provide speed, congestion, travel time, and travel time reliability data. For more information regarding the vendors or accessing this type of data, see

Chapter 2, Section 2.3.3

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