Denver’s new 15th Street bike lane includes green and red painted sections, which help to remind car drivers to watch for cyclists. Such green-painted bike lanes have become common around the US in recent years, but different places use different colors. Here are some examples.

Dark green. Used in Washington and New York.

Copenhagen’s blue. Photo by Steven Vance.

Amsterdam’s dull red, also seen in Vancouver and many other cities. Photo by Scott Lowe.

Madison’s bright red. Photo by benet2006.