the embodiment 46 seen in fig9 are intended to break when compressed and are replaced thereafter referring now to fig1 there is depicted a barrier 52 further provided with support means for a row of spaced apart landing lights 54 disposed along the length thereof the sheet metal profile provides a convenient protective housing for the electric cable 56 providing power to the lights 54 in fig1 there is seen a fod bather 58 further provided with drainage channels 60 disposed between ground attachment means 62 this drainage is useful in preventing standing water on the runway resulting from rain washing of aircraft or the operation of fire extinguishers the barrier 58 seen is made of perforated metal 64 to allow drainage and to facilitate collapse when compressed by a landing wheel alternatively other permeable materials may be used such as recycled rubber turning now to fig1 and 13 there is seen a barrier 66 wherein hinged struts 68 are provided and are pivoted at 70 proximate to the upper edge 72 of the barrier 66 a fixed actuator 74 is held substantially at ground level an telescopic arm 76 forms part of the strut 68 near the fixed actuator 74 the actuator 74 can shorten the strut 68 as in fig1 for lowering the barrier 66 or lengthen the strut 68 as in fig1 to raise the barrier.