Arrow
Chase down Alley
Diggle is cornered in an alley but is saved by Felicity, and later he corners his brother behind a fence in episode 4x20 “Genesis”.
Alley near Gramercy
Diggle trades fire with Andy while talking to Lyla on the phone in episode 4x20 “Genesis”.
End of Chase
Roy stops the truck with an explosive arrow in episode 3x01 “The Calm”.