Officials are asking visitors to the Blue Ridge Parkway to be polite on the narrow and curving mountain roadway during the summer tourist season.

Parkway officials said cyclists, recreational vehicles and anyone driving slowly should move over for regular traffic along the roadway in North Carolina and Virginia. Parkway officials said Wednesday that slower traffic can move into overlooks as needed.

Chief Ranger John Garrison said an increase in collisions has been reported along the 469-mile parkway during the first six months of 2008.

Rangers plan traffic safety checkpoints along the parkway during the tourist season to reinforce traffic regulations.