Abstract: A system of prefabricated board mats for assembling plank roads for supporting heavy equipment on unprepared surfaces. The system is based on a standard eight foot by sixteen foot three-ply treated lumber prefabricated board road section. Individual board mat sections are linked in the direction of travel using a mating male and female plug and socket system to evenly transfer the weight load of heavy equipment in the direction of travel. Angle iron interlocks are provided laterally at the corners. The mats are lifted by use of three or more eyebolts countersunk into the top of the mat at strategic locations so that balance is maintained.In practice a porous protector filter cloth section is laid on an area where a board mat is to be placed.