On highways, the maximum speed limit is 55 mph. When driving car rentals in Glen Ellyn near school zones, especially between 7 am and 4 pm on school days, you might have to lower your speed to 20 mph. If driving down alleys, don't exceed a speed of 15 mph. On highways with four-lane roads, you can drive 65 mph. On toll roads and interstates, the upper speed limit is 70 mph. The city has many speed-limit signs posted so drivers will know to maintain the right speeds in every zone. Additionally, traffic cameras monitor drivers’ speed and help keep speeders in check, thus improving road safety. Search rental cars on KAYAK