Local residents have been complaining the popular bike tours from the Haleakala summit to Paia shoreline can be dangerous and create traffic jams in the area.

"It was like, 'We need to start doing things ourselves before that happens,' " said Phil Feliciano, the owner of Cruiser Phil's, of any government regulation.

In the latest accident involving a bike tour, a 44-year-old woman suffered serious head injuries last Monday. She apparently crashed at one of the curves in the road coming down Haleakala.

All five bike tour operators have agreed on 12 places in upper Kula where guides can pull over the line of bikers to let traffic pass.

Previously each company used different pull-offs, and they had different standards for when to pull over.

Now they have a "standardized" list of spots, and they've all agreed to get off the road even if just one car is following, said Rich Goodenough of Maui Downhill.

"The longest (a driver) would have to wait between these safe pullover zones is about a minute to a minute and a half," he said.

One of the biggest problems is a roughly two-mile stretch of Crater Road through residential areas of upper Kula. The area's narrow, old bridges and lack of paved shoulders force bikers to ride on the road, which in turn causes slow-moving tour escort vans to back up on the road behind.

To prevent such traffic jams, Cruiser Phil and two other tour operators — Bike It Maui and Maui Mountain Cruisers — are having their vans wait by the side of the road while the bikes ride ahead, then "leapfrog" down the road to catch up with the convoy.

This should allow the bikes to stay out of the lane wherever there is a paved shoulder, and traffic to pass the convoy safely at normal driving speeds, said Jon Thuro of Maui Mountain Cruisers.

But the two largest companies, Maui Downhill and Mountain Riders, who together hold more than half the vans in use by the industry, haven't adopted the leapfrog system.

Goodenough said Maui Downhill hasn't been using the "leapfrog" system because he doesn't think it's safe. If one of his riders had an accident, the van should be nearby to help, he said.

As a compromise, he said he would lengthen the distance between the van and the bikes, which could allow cars coming out of driveways or intersections to get ahead of the van and pass the tour.

"We're experimenting with what that distance may be," he said.