16e being of the largest dimension as illustrated in fig1 and 2 each of the sections 16a 16b 16cand 16d is of generally circular configuration whereas section 16e is made of a plurality of sides or facets arranged next to each other to define a closed configuration such as an octagon having eight sides the hollow member 12 is enclosed by a top portion 18 in which there is inset a pair of wells 24a and 24b for respectively receiving warning light 72a and 72b as shown in dotted line in fig5 the warning lights 72a and 72b are releasably secured within the wells 24a and 24b respectively by bolts not shown as particularly illustrated in fig1 and 3 well 24a is associated with recesses 28a and 28b a bolt is inserted through a bolt receiving passage 32 so as to pass through a threaded opening within its warning light 72a before coming to rest in recess 28b whereby the warning light 72a is retained in its well 24a similarly the well 24b is associated with recesses 30a and 30b for receiving a bolt through its threaded bolt receiving passage 34 as required by various state and federal regulations reflective strips 20a and 20b are illustratively disposed about sections 16b and 16c to make the traffic.