On the westside? Not within several miles of the highway they can't.
Every now and then someone will stray from the forest trails by Vasquez over the top of the ridge and into Second Creek, but to climb up from US40? That's just inane. And very illlegal.
If you ever see this going on, please get a registration or license plate number (or better yet a photo including the number) and forward it on to me at fobp_infoATyahoo.com and we'll notify the appropriate authorities.
Also, to clarify: there is limited snowmobile access allowed for Qwest and certain govt agencies to climb the road to the top of Mines Peak to service the towers up there. They aren't allowed to roar up the ski run from the parking lot, even though they sometimes do.