Nevertheless, 30 km/h will not be introduced on all 41 roads. On 7 stretches, the speed limit remains in place for reasons of air pollution control, because limit values are still exceeded here. On 11 other sections, the limit remains in place for road safety reasons, for example because there are retirement homes or daycare centers along the roads. This leaves 23 road sections where a speed limit of 50 km/h now applies again during the day. The Senate also ordered a 30 km/h speed limit on a number of main roads at night - between 10 pm and 6 am. This decision was taken for reasons of noise and therefore health protection and, according to earlier information, affects roads with a total length of 230 kilometers.