This document analyzes shockwave formation and propagation behind a slow moving truck. It contains the following key points: 1. A slow moving truck at 10 mph creates a shockwave that moves at the same speed (10 mph) in front of it, slowing traffic. A second shockwave forms behind it, moving at 2.1 mph, as traffic builds up in a platoon. 2. For a 10 minute period, the front of the platoon travels 1.67 miles while the rear travels 0.35 miles, extending the platoon to a maximum length of 1.32 miles containing 159 vehicles. 3. When the truck exits after 10 minutes, the platoon dissipates as the front shockwave now moves