The California Roadside Emissions Test is a voluntary program. You have the right to refuse to participate for any reason, not necessarily that your Ford F-150 has been passing the smog check regularly. There is no "passing" or "failing" the roadside emissions test. Your vehicles results are used by the State for developing a profile of the vehicles on California's roads. At the end of the roadside test you are given a Vehicle Inspection Report which provides important information about your vehicle.
