In the short term, increased travel on new road space can come from one of two sources: diverted travel and induced traffic. Diverted travel occurs when people divert their trip from another road (change in route) or retime their travel (change in timing). For example, people might travel to work earlier than they would otherwise like, in order to avoid peak period congestion – but if road capacity is expanded, peak congestion is lower and they can travel at the time they prefer.