A section of Watson Road has been closed for two weeks of "emergency repairs", Blackpool Council announced.
The underpass between Bond Street and the Promenade in South Shore, will be closed to traffic while the work is completed.
A spokesman for Blackpool Council said: "The closure is to allow repairs to be made to the concrete structure over the road, and for a survey to be carried out at the same time".
A spokesman for The Pleasure Beach said the road was shut for "routine maintenance".
The council asked drivers who use Watson Road to plan extra time for their journeys.