Excessively loud automobiles driving in Longmont continue to be an issue for several residents and business owners. So much so, that public safety officials have proposed prohibiting a motor vehicle’s engine or exhaust system from being audible 300 feet away. Public safety officials landed on the 300-foot threshold after noise from traffic hardly registered above normal, ambient sounds when measured from that distance. “It’s a distance that … most people can visualize,” Longmont Master Police Officer David Kennedy said, pointing out how the 300-foot length was similar to that of a football field’s distance. Traffic flows along Main Street in Longmont on Monday.