A view west along Navesink River Road Thursday morning. (Click to enlarge)

Police in Middletown and Red Bank are asking motorists to plan alternate travel routes following a “partial collapse” of Navesink River Road in Middletown.

The collapse occurred between the North Jersey Coast Line railroad tracks and Hubbard Avenue, according to an alert issued by Middletown spokeswoman Cindy Herrschaft.

As a result, the road will be closed indefinitely to all pedestrian and vehicular traffic, Herrschaft says.

The detouring of traffic is expected to impact West Front Street in both Middletown and Red Bank, as well as Rector Place and Shrewsbury Avenue in Red Bank, especially at rush hour, borough police said in a separate alert.