Speeding has become rampant on the Illinois tollways around Chicago, a fact well established by the Tollway in several studies obtained by the Tribune. The data, like that collected on the Everett Road overpass in April, showed that along seven tollway stretches with 55 mph limits, most drivers are pushing the speedometer above 66 mph.
Only a few are obeying the law. In those stretches, an average of 1 out of 20 motorists drives at or below that limit.
As the state prepares to increase the maximum speed to 70 mph on some interstates starting Jan. 1, the Tollway studies and other research suggest that those large black numbers posted on roadside signs don't dictate how fast people really go. Instead, drivers are influenced by other factors, from road conditions to traffic flow and even some basic traits of human psychology.[...]
Box salesman Lew Monckton, who travels the Illinois Tollway frequently, sets the speed on his Chrysler at 9 mph above the 55 mph limit, except on I-294.
That's exactly what I do. On the stretch of tollway I drive weekly, 64mph is just fast enough to prevent other drivers from tailgating, but slow enough to avoid speeding tickets.