US Patent 9273437 Mobile barrier

A safety trailer is shown, the device including first and second platforms, at least one of the first and second platforms having an axle and wheels attached thereto; a plurality of interconnected wall sections positioned between and connected to the first and second platforms, the plurality of wall sections defining a protected work area on a side of the trailer; and wherein each wall section has a longitudinal member extending a length of the wall section, the longitudinal member being positioned at the approximate position of a bumper of a vehicle colliding with the wall section.