Van Wee also likes to reason further. Cars drive 25 percent more efficiently at 100 kilometers per hour than at 130. “An additional advantage is that people travel fewer kilometers in the long term. “The theory of a constant travel time says that we travel on average 60 to 75 minutes per person per day. spend. The traffic system is now much better than in, say, 1950. This has not meant that we are at home longer, but that we travel more kilometers. We accept a job further away from home. We visit friends in the evening, etc.,” Van Wee explains. “So as speeds drop and travel times increase, car use will start to decline a bit.”