The District has eliminated roughly 150 vehicles from its fleet of several thousand since January by ridding itself of cars used infrequently by government agencies.

Reducing the city’s vast vehicle collection, for environmental and financial reasons, was among Mayor Adrian Fenty’s goals for his first 100 days. The Department of Public Works, which oversees the District’s 3,500-vehicle fleet — 1,900 cars and pickups and 1,600 heavy trucks — claims to have met the challenge by identifying any light vehicles older than the 2005 model year that were driven less than 1,000 miles in 2006.