My preferred route to Pasadena. Can also take River bike path instead of Riverside Dr. to Fletcher. Fletcher from Riverside to San Fernando Rd. is very unsafe for cyclists. Road condition on York, just east of the 110 is awful. There's a short but steep hill to climb from Arroyo to W Holly street. Walnut helps to avoid heavy traffic on Colorado. Can also turn off Arroyo at California for a longer but less steep climb. Then you enter Old Town from the south. by Cbogart