Some delays and a road closure will greet some late night visitors at Yellowstone National Park as construction crews finish the final phase of an improvement project.

A part of Grand Loop Road in Yellowstone's northwest corner will be closed nightly and drivers can expect to see 30-minute delays in some areas through the next month or two.

The Associated Press reports construction crews are widening the road and reconstructing a bridge, among several other changes.

The project marks some long-awaited improvements on the road after it was built in the 1920s.