Samenvatting
A study is made from 1.7.1977 till 30.6.1981 for a speed limit of buses on German motorways. The study program has the following themes (1) accident rate (2) traffic flow (3) psychological stress of the bus driver (4) improvement in bus construction (5) side effects and (6) joint results. The pros and cons of an increase from 80 to 100 km/h are not yet studied completely.