What is a common feature of bicycle lanes?

Bicycle lanes are typically marked by a solid white line to clearly differentiate them from regular vehicular lanes. This solid line serves to indicate that the lane is reserved for bicycles, providing a visual cue for both cyclists and drivers about the designated space for bicycle use. Marking lanes in this way promotes safety by helping to prevent conflicts between different types of road users.

The other features mentioned, such as being paved in red, being always placed next to sidewalks, or being used as passing lanes for vehicles, do not accurately represent the common characteristics of bicycle lanes. While some bicycle lanes may be colored differently in some regions for visibility, this is not a universal standard. Additionally, while many bicycle lanes are indeed situated alongside sidewalks, this is not a rule; there are many instances where bicycle lanes run alongside vehicular traffic without an adjacent sidewalk. Moreover, bicycle lanes are designed specifically for bicycles rather than serving as passing lanes for vehicles, ensuring that cyclists have a safe and dedicated space on the road.