In the City of Chihuahua, for example, 61.3% trips made each day are done through cars. Indeed, only 16.5% of the trips are made through public transport, which is far below the Mexican national average which is between 50 and 60%. The increased use of automobiles has also been stimulated by improved road conditions (i.e. the percentage of paved areas in the City of Chihuahua grew from 50% in 2000 to 69% in 2007). Recent efforts to promote more public transportation have been challenged by the high accident rates of buses.