"The California Cycleway was an elevated wooden bicycle highway that was designed to go from Hotel Green in Pasadena down the Arroyo, past Highland Park and into Downtown Los Angeles, ending at the Plaza on Olvera Street. Part of the design was to be a completely uninterrupted path by bridging over obstacles like creeks, roads, train tracks, and maintain only the slightest of grades (no more than 3%) over the 9 miles of smooth wooden track over an elevation of 600 feet" Via: