Bicycling is an increasingly popular transportation mode in Sacramento, which enjoys a mild climate and flat terrain. Bicycling is especially common in the older neighborhoods of Sacramento's center, such as Alkali Flat, Midtown, McKinley Park, Land Park, and East Sacramento. Many employees who work downtown commute by bicycle from suburban communities on a dedicated bicycle path on the American River Parkway. Sacramento was designated as a Silver Level Bicycle Friendly Community by the League of American Bicyclists in September 2006. The advocacy organization Sacramento Area Bicycle Advocates co-sponsors the Sacramento Area Council of Governments' May is Bike Month campaign.