The westbound main entrance to Columbia Park off Highway 240 will be closed from 4-6 p.m. July 24-25 for the Water Follies festivities.
That's the time when the annual event will be wrapping up and thousands of race fans will be driving out of the park.
The closure is to ensure safety for vehicles and pedestrians. Vehicles also are banned from stopping on the highway to watch the races or to drop off or pick up spectators.
Ben Franklin Transit will provide special shuttle service to and from Columbia Park. More information about the bus schedules is at bft.org/special.html.