Barry saves a bike messenger who is about to be hit by a taxi in pilot episode.
Barry battles Heat Wave & Captain Cold in the street in episode 1x10 "Revenge of the Rogues".
Oliver rides his motorcycle after Kendra Saunders his taken by Hawkman in episode 2x08 "Legends of Today".
The team uses the hologram of The Flash to stop some criminals in episode 2x20 "Rupture".
The team gathers to stop Grodd's army at the edge of town when Grodd takes control of Joe to deliver a message to Barry. Later the three speedsters arrive back at the street to hold of the gorillas until Cisco and Cynthia can arrive with help in episode 3x14 "Attack on Central City". Cisco uses a vibe portal to catch Wally after he is shot off a building by Kadabra in episode 3x18 "Abra Kadabra".
Tommy talks to Laurel on the phone while walking down the street in episode 1x13 "Betrayal".
Diggle drops Moira off at a building and then follows her inside in episode 1x13 "Betrayal".
Roy stops the police convoy carrying Oliver and turns himself in as the Arrow in episode 3x18 "Public Enemy".
Diggle chases the virus carrier through the street in episode 3x23 "My Name Is Oliver Queen".
Oliver gives a passionate speech of hope to a group of rioters and later fights with Darhk in episode 4x23 "Schism".
Mon-El attempts to be charitable and is captured by Cadmus for his trouble in episode 2x06 "Changing".
Mon-El and Guardian stop the mutated Dr. Jones from killing Rand O'Reilly and other bystanders until Supergirl can arrive to stop him once and for all in episode 2x06 "Changing".
Reign and Kara smash to the ground in the street and Kara takes a beating in front of a bunch of bystanders in episode 3x09 "Reign".
George Usher leaves a restaurant and walks back to his car while being watched by Tooms in episode 1x03 "Squeeze".
Source: XF Marks the Spot
Scully parks her car on the street outside headquarters and later she has to fight her way through the riot to get to it in episode 10x06 "My Struggle II".