Sanaa has the most traffic accidents in Yemen, with 2,898 in 2013, more than twice as many as Ta'izz (which had the second-highest total). Contributing factors include lax enforcement of traffic laws, lack of traffic signals, lack of pedestrian crossings, and bad parking practices (for example, double parking is common, even when there are available parking spaces nearby). The number of traffic accidents plummeted in 2015 by more than 50%, as the escalation of the conflict in Yemen led to reduced mobility, as well as fuel shortages which led to  decreased use of personal vehicles.