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RSD Texas

Texas On-Road Remote Sensing Program

In the late 1990s, Texas was facing expansion of its I/M program due to worsening air quality and a non-attainment reclassification by the U.S. EPA. A decentralized two-speed idle I/M program was active in several counties. Instead of expanding the program into outlying counties in each metropolitan area, the Texas Department of Public Safety used three RSD3000s to collect on-road vehicle emission measurement data and identify high-emitters among the commuting fleet that were contributing disproportionately to air quality in the core metropolitan areas.

These "commuter polluters" would be notified and subject to the core county I/M test. This program operated for over three years, but Texas once again came under pressure to expand its I/M network and, this time, upgrade to an ASM test. ESP began operating the Texas On-Road Vehicle Emissions Testing (TORVET) remote sensing program in December 2001. The on-road remote sensing program is aimed at:

-Identification of commuter polluters.
-Raising public awareness.
-Deterring vehicle tampering and fraudulent inspections.

The new remote sensing program grew to focus on more than commuter polluters. By 2004, it became a comprehensive on-road testing program that included identification of core I/M area high emitters and fleet evaluation in an I/M area that would gradually expand from 4 to 15 counties.

Today, ESP collects over 1 million measurements in 17 core counties within the state of Texas. High emitters registered with the 17 core counties as well as frequent "commuter polluters" from 28 additional surrounding counties are screened with two remote sensing devices that operate on a full time basis.

The program has specific fleet coverage requirements in each of the 17 counties and requires high emitters to be notified for an off-cycle inspection.

ESP provides the Texas Department of Public Safety a turnkey service that:

-Collects on-road, "in-use" vehicle emission measurements.
-Processes and maintains all records in a secure database.
-Regularly selects the highest emitters for TX DPS review.
-Sends registered notices to high emitters each month.

Over the life of this program, using remote sensing technology, ESP has successfully customized our system to accommodate the changing needs for Texas.

Buy ESP analyzers, EVAP units, service agreements and parts by visiting our online store.

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For AccuScanâ„¢ Remote Sensing Technology:
Phone: 888-377-7971


May 2010 article/video on "Remote Sensing Could Exempt Cars From Emissions Test"


2009 Clean Air Conference Presentation: "Pre-screening and Evaluation of High Evaporative Emissions using RSD"(PDF 685 KB)by Jim Sidebottom, Colorado Department of Public Health and Environment

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