Tigard car drivers are required to always follow the posted speed restrictions on specific highways. If you are traveling on a route without a speed restriction sign, you are urged to abide by the general speed limits set by the Tigard highway authorities. When riding on any route in a Tigard urban or residential zone, keep your top speed at 30 mph. When traveling on the unpaved county roads in Tigard, always keep your speed at 30 mph. When driving near school zones in Tigard, the 20- mph speed restriction is always to be observed. The overriding principle is that motorists adhere to the 70- mph maximum speed limit on Tigard's rural interstates. Search rental cars on KAYAK