This is a cattleguard Gallup Trails 2010 designed for mtb trail use. The purpose is to let bikes roll on through but keep the cows from walking through. Cattleguards are very common on roads in the western US and work well on bikes trails too. Saves a lot of gate opening and closing.
Thought I would share the design...
Mtbr's 2016 Winter Biking GearReviews and Roundups
Results 1 to 6 of 6
Thread: MTB Trail Cattleguards