<Li> Motor way toll booths have been replaced with electronic toll systems (Hills M2 was the last to do so on 21 January 2012); time - of - day tolling is in use on the Sydney Harbour Bridge, and Sydney Harbour Tunnel to provide cash incentives for commuters to remain out of the city in peak times . </Li> <P> In São Paulo, Brazil, each vehicle is assigned a certain day of the week in which it cannot travel the roads during rush hour (7--10 am and 5--8 pm). The day of the week for each vehicle is derived from the last digit in the licence plate number and the rule is enforced by traffic police . This policy is aimed at reducing the number of vehicles on the roads and encouraging the use of buses, subway and the urban train systems . </P> <P> In the pico y placa (peak and license plate) program in Bogotá, drivers of non-commercial automobiles are prevented from driving them during rush hours on certain days of the week . The vehicles barred each day are determined by the last digit of their license plate . The measure is mandatory and those who break it are penalized . The digits banned each day are rotated every year . </P> <P> In the capital city of Athens the rush hours are usually 7--10am and 4--7pm . During these periods there is congestion in the Athens Mass Transit System, most notably in buses and metro, as well as road traffic . The 6 - car trains of Athens Metro carries almost 1.5 million passengers during a typical week day . </P>

Where did the term rush hour come from