CRE Awareness and Operations Practice Test 2026 – Complete Exam Prep Resource

The key identifying feature is the horseshoe-shaped ends. DOT 407 cargo tanks have a distinctive end contour that resembles a horseshoe, combined with a cylindrical body. This curved end shape is a quick visual cue you’ll see on these non-pressurized tanks used for liquid transport. It helps differentiate DOT 407 tanks from others that may have flat or differently contoured ends, and it reflects the tank’s design for low-pressure, non-pressurized service.