Overheight vehicle detection systems on I-10 in Houston contributed to 20 fewer bridge hits per year, saving TxDOT more than $2 million in annual bridge repair costs.

Cost-benefit analysis of ITS project in the Houston, Texas.

Date Posted

ITS instrumental in reducing Texan congestion

Summary Information

In January 2015, overheight vehicle detection systems (OHVDS) were implemented on Interstate I-10 in Houston to improve safety for truckers and reduce numbers of overheight vehicle hits on several low-clearance bridges (35 hits in 2014).

Two detection systems were deployed. Each used an active dual-beam infrared sensor installed 14 feet above the roadway to detect overheight trucks and then activated a dedicated dynamic message sign (DMS) to warn drivers using a single-phase three-line message: "OVERHEIGHT MUST EXIT I-160." To encourage compliance, overhead static warning signs reading "TRUCK HEIGHT MEASUREMENT ZONE AHEAD" were installed in 2018, and CCTV camera systems were used to capture violators.


TxDOT managers indicated the cost of repairing a bridge after an OHV hit ranges from $100,000 to $300,000. With an estimated 20 fewer bridge hits per year, TxDOT and taxpayers will realize significant cost savings and highway users will experience fewer delays.

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