of the stage stop of Everett on the east, prevent motor vehicles from passage. When the road is closed, Aspen is isolated from the east and Highway 82 up the valley from Glenwood Springs becomes the only vehicular access to the city during its busy ski season. Even when the pass is open, not all vehicles may use the road. Oversized and overweight vehicles are prohibited from the pass, as are all vehicles or vehicle combinations longer than regardless of weight or size. This precludes use of the pass by tractor trailers, buses, and recreational vehicles. Some truck drivers use the pass despite the prohibition. They are generally either unaware of the restriction and following routes plotted by their GPS devices, or aware of it and willing to risk the fine for the sake of the time and distance saved. The resulting accidents have sometimes forced the closure of the pass. CDOT put up larger signs advising drivers of the ban and worked with GPS device manufacturers so their software notes the restriction. Aspen officials have suggested increasing the fines as a deterrent. Driving through the pass is challenging. Both approaches require 6% grades due to the height of the pass, and require navigating hairpin turns with advisory speeds of 10 mph (15 km/h). Rockfalls, particularly on the approach from Aspen, have narrowed some sections to a single lane 12 feet (4 m) wide with temporary traffic lights. On the Twin Lakes approach, they have resulted in temporary closures. Other vehicles frequently enter the road unexpectedly at the many parking areas for campgrounds and other recreational attractions, and bicyclists make frequent use of Highway 82 as well. Lastly, the weather at the pass can be unpredictable and vary considerably from conditions in either Aspen or Twin Lakes. There may be thunderstorms on otherwise clear days, and snow can occur at any time of the year. CDOT advises anyone coming to the pass for outdoor recreation to take precautions against the effects of the high altitude and the changeable weather. Independence Pass Foundation Since the days of the stage road avalanches and rockfalls often forced closures of the highway, partly due to the massive disturbance of the land during the road's construction. No attempt was made to remedy this until shortly after the automobile road was built. In the 1930s, as a relief project during the Great Depression, a crew from