When you take to the roads in your hire car, you need to make a note of the strict speed limits in place around Seattle. The speed limit on residential streets is 20 mph, with an increase to 25 mph on arterial roads. You will find many signposts warning you of the limits in place and advising you to slow down. If you are driving close to an elementary school, you can expect to go through speed cameras, allowing them to strictly enforce the 20-mph speed limit. Search rental cars on KAYAK