a c and between the platforms 104 a b the road or other work surface is exposed within the work zone area 204 the work zone area 204 is sufficiently large for heavy equipment to access the work surface fig2 c shows the traffic facing side of the protective barrier 200 as can be seen in fig2 c the protective barrier 200 presents a protective wall 208 proximate to the traffic zone the protective wall 208 includes the rigid wall 132 and number of wall sections 108 a c which are interconnected to the two platforms 104 a b the bottoms of the wall sections 108 a c are elevated a distance 280 above the roadway 284 fig5 a b additionally show a portion of the caboose 120 which interconnects to and is disposed underneath a selected one of the platforms 104 a b the wheels of the caboose 120 in the deployed position of the trailer 100 shown in fig2 c are covered with a piece of sheet metal 212 during transport this piece of sheet metal 212 can be disconnected from the platform 104 and positioned in a stowed manner on top of one of the platforms 104 although stands 290 are shown in place at either end of.