The Frederick County Planning Commission voted 4-2 on Wednesday to approve a site plan, with conditions, for two buildings on 125.66 acres in Monrovia, despite opposition saying it would exacerbate traffic problems. West of the site plan is a Costco distribution center, which has many trucks coming and going. Some trucks, despite numerous warnings and prevention efforts, drive south on Md. 75, and get stuck under a railroad bridge that runs over Md. 75.