When going thro’ Dickinson on I-45 Fwy headed south, just as you go over the FM517overpass there is an on-ramp on the right bringing feeder traffic up on the Fwy… They park right there at that on-ramp, can get either people on the feeder, or on the Fwy…. At the next overpass going south, (Hughes Road) they have a habit of driving out into the grass and hiding behind the berm (the mound of dirt that supports the overpass) on the south side… You wouldn’t usually notice them because the overpass blocks the ground view, and you almost have to look back to see them.