Section 510 Of Article 3. The State Highway Routes From California Streets And Highways Code >> Division 1. >> Chapter 2. >> Article 3.

. Route 210 is from:
  (a) Route 5 near Tunnel Station to Route 57 near San Dimas via the vicinity of San Fernando.
  (b) Route 57 near San Dimas to Route 10 in Redlands via the vicinity of Highland.