UW-Madison officer Erik Pearce says 15 cops and 11 security officers patrol the campus regularly, logging above 2,200 hours on bikes last year, and more than 3,100 in 2010. The UW police have used bikes since 1992. Pearce likes to point out that bike policing is green and cost-effective. According to Madison police officials, purchasing and equipping a squad car can cost about $47,000, not to mention the approximately 2,400 gallons of gas each burns in a year.