I've never heard of track traps, but that's a great idea. What do you do, just scrape a line across the road to see if someone's passed?
Just remove all the current tracks by smoothing out the ground. Old farts carry a track broom. I like to know if someone or a critter has visited while we are gone. Setting track traps is fun while backpacking. Do a perimeter around your camp before bed and check it in the morning. You may be surprised what came by and you didn't hear a sound. What you find shouldn't lead to fear but the fact that for the vast majority of times what's out there only has a passing curiosity about us.