Bike lanes are designated paths on roadways specifically for cyclists. They help ensure the safety of bike riders by separating them from motor vehicle traffic. These lanes can be marked with painted lines, signs, or physical barriers, making it clear where cyclists should ride. Bike lanes can vary in design, including protected bike lanes that have barriers separating them from cars, and shared lanes where cyclists and vehicles share the same space. Cities often implement bike lanes to promote cycling as a sustainable mode of transportation and to reduce traffic congestion and pollution.