 At Level 2, when traffic reaches a few percentage points above that level, more transit service would be added, and parking rates raised slightly to fund the additional buses required to reduce headways.Level 3 would be implemented when traffic levels had exceeded the baseline by 5–10%, and would use more forceful measures such as steeper increases in parking fees, deliberately limiting the number of spaces available, and making some parts of downtown Aspen car-free zones.The current bridge along Grand Avenue over the Colorado River and I-70 just east of the highway's western terminus dates to 1953.