If traffic was getting crowded, a second tier would be added to the price and would rise until congestion eased. Based on the cost, drivers could decide either to go back home and take the trip to the bookstore later, or decide that their dentist's appointment was too urgent to miss. Prices would act as a mechanism for coordinating people, so that the roads would only be used at rush hour by people with the greatest needs. Vickrey's ideal has crept into a few cities. Trondheim in Norway has 12 toll plazas through which cars must pass if they want to get downtown.
Billing is electronic, and automatic.
Highway 91 in California guarantees a free flowing ride and varies prices to keep its promise. Highway 407 in Toronto is a showcase for toll roads in Canada. These are the exceptions. The rule is the mayhem we know in all major Canadian cities. Our resistance has to do with habit.