A pop-up bicycle lane is a temporary bike lane that is used to test, pilot or trial new infrastructure to improve conditions for people riding bicycles. In the event that it is successful, interventions can be implemented permanently.
A pop up cycle lane installed in Berlin during the COVID-19 pandemic in spring 2020
COVID-19 pop-up cycle lane in Chichester, England, August 2020
Bike lanes (US) or cycle lanes (UK) are types of bikeways (cycleways) with lanes on the roadway for cyclists only. In the United Kingdom, an on-road cycle-lane can be firmly restricted to cycles or advisory. In the United States, a designated bicycle lane or class II bikeway (Caltrans) is always marked by a solid white stripe on the pavement and is for 'preferential use' by bicyclists. There is also a class III bicycle route, which has roadside signs suggesting a route for cyclists, and urging sharing the road. A class IV separated bike way (Caltrans) is a bike lane that is physically separate from motor traffic and restricted to bicyclists only.
Class IV separated bike way in Cambridge, Massachusetts, the physical division for this particular bike way is the line of parked cars.
Protected bike lane in New Orleans
A van parked in an unprotected bike lane.
Contra flow bike lane in Cambridge, Massachusetts