Motorists can take their cars to three locations in Northern Virginia this month for free, five-minute tests of auto emission control systems.

The free tests are part of an areawide inspection program conducted by students in vocational education classes at participating high schools and community colleges in cooperation with the Metropolitan Washington Council of Governments.

The tests are designed to give motorists information on the condition and maintenance of their car's emission control systems and suggest easy adjustments that can be made to improve the condition of the cars, and save money on fuel costs. They will also let motorists know if their cars are meeting federal air quality standards or contributing to the air pollution problem in the Washington area, which is caused primarily by pollution from cars.

Testing will be done at the following places: Northern Virginia Community College Automotive Career Training Center, Bailey's Crossroads Center, 3443 S. Carlin Springs Rd., Alexandria, Saturday, 9 a.m. to 5 p.m.: T.C. Williams High Shcool. 3330 King St., Alexandria. Today, Oct. 14, 17, 18, 19, 20 and 21, from 8 to 11 a.m.: Arlington Career Center. 816 S. Walter Reed Dr., Arlington, Oct. 22 and 29, 10 a.m. to 4 p.m.