How many total sides must placards be displayed on for vehicles transporting propane over the required weight limit?

For vehicles transporting propane over the required weight limit, placards must be displayed on all four sides of the vehicle. This requirement ensures that the vehicle is easily identifiable as carrying hazardous materials, specifically propane, which is classified as a flammable gas. The four-sided display of placards allows for clear visibility from all angles, enhancing safety by informing other road users and emergency responders about the potential hazards associated with the vehicle's cargo.

Displaying placards on all sides also complies with regulatory standards set forth by organizations such as the Department of Transportation (DOT) and the Pipeline and Hazardous Materials Safety Administration (PHMSA). This visibility is crucial in mitigating risks during transportation and ensuring that everyone involved in their potential response to an incident is aware of the flammable contents being transported.