Truck mounted attenuators (TMA) are also known as crash trucks and shadow vehicles. Rocky Mountain Signing’s truck mounted attenuator rental fleet are attached to the back of our 26,000 pound GVW trucks to allow the maximum protection for motorist and workers in a work zone. The truck mounted attenuator is designed to absorb the kinetic energy caused when two vehicles collide into each other. Many lives have been saved; both drives of vehicles crashing into truck mounted attenuators, as well as the workers stationed in front of the truck mounted attenuators. With each passing year, the safety requirements for protecting the traveling motorist as well as the highway work crew’s increases. Truck mounted attenuators are in higher demand now than ever before, because they work.