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§ 51.371 On-road testing.
On-road testing is defined as testing of vehicles for conditions impacting the emission of HC, CO, NOX and/or CO2 emissions on any road or roadside in the nonattainment area or the I/M program area. On-road testing is required in enhanced I/M areas and is an option for basic I/M areas.
(a) General requirements. (1) On-road testing is to be part of the emission testing system, but is to be a complement to testing otherwise required.
(2) On-road testing is not required in every season or on every vehicle but shall evaluate the emission performance of 0.5% of the subject fleet statewide or 20,000 vehicles, whichever is less, per inspection cycle.