New York City has built 200 miles of bike lanes in the last three years.

But a new study by two Hunter College professors finds that those bike lanes are often blocked by cars or trucks.

The study released Wednesday found that a cyclist traveling in a bike lane will encounter a vehicle during a stretch of just five to six city blocks more than 60 percent of the time.

The researchers surveyed 492 randomly selected Manhattan blocks that have bike lanes between Sept. 22 and Oct. 23.

The study said the city needs to try harder to restrict bike lanes to bikes.