a quick drying epoxy was used in the anchor bolt holes 23 and at the end of twenty five 25 days there was no evidence of loosening of the anchor bolts 26 the mat 11 can be quickly removed by withdrawing the anchor bolts 26 and washers 24 then inserting a shorter bolt not shown into the sleeve 21 to protect the hole 3 and sleeve 21 from filling with debris re installation of the mat 11 can then be easily and quickly accomplished it is contemplated that a mat such as 29 can be used in an emergency by merely being located in the path of oncoming vehicles as is shown in fig3 without any initial securement to the highway however actual testing has shown that the mat tends occasionally to 34 dance 34 on the highway and to change its position when run over by one or more vehicles for that reason securement of at least a temporary nature is recommended the provision of the springs 36 at one end or at both ends of the cables 34 near the stakes facilitates a retention of the mat 29 in its original position with the slots 30 transverse to the flow of traffic when the mat 29 is no longer necessary it is readily removed by withdrawing the stakes 37 and pulling the mat off the highway without significant inconvenience to traffic another embodiment not shown is the provision of a single elongated strip of belting material of the type referred to hereinbefore in connection with the mats 11 of the various embodiments illustrated the strip could have for example the dimensions of a slot 12 of fig1 and the thickness of the mat 11 or for.