Don't know about there, but in Oregon you just know where it's enforced. The limit here is 55 everywhere, but if you can get a clear stretch you can drive 80mph

Don't know about there, but in Oregon you just know where it's enforced. The limit here is 55 everywhere, but if you can get a clear stretch you can drive 80mph on I-5 without being stopped anywhere within Portland city limits. Once you get a little outside, the state police will stop you for going 60.