The roadwork notices were tied to trees and signposts on a Friday along one of the world’s best-known streets. The following Monday, crews arrived on Central Park West and began setting up a protected bike lane, which eliminated about 200 parking spaces in an almost mile-long stretch.

The next day, representatives for a luxury Central Park West condo went to court to block the bike lane, opening another front in the increasingly pitched battle between bicyclists and motorists for precious space in the nation’s largest city.

In a city with gridlocked streets, creaky public transit and where cycling deaths are on the rise, the opposing lines are clear.

Bicycle advocates and city officials want to make the roads more bike friendly — and safer — at a time when the popularity of urban biking is soaring. On the other side are those who accuse the city of becoming ever more hostile toward drivers.