Motorcycle warning signs have been installed at the intersection of Issaquah Hobart Road and Southeast May Valley Road as part of a private campaign to reduce intersection collisions in King County.

The “Watch for Motorcycles” warning sign was one of four installed in county space by insurance company Allstate as part of its Once is Never Enough campaign.

Issaquah insurance agent Aaron Whitcomb said visibility at the May Valley intersection was “pretty good,” but added that the risks of motorcycle collisions required special attention.

“I think their smaller size leads to more accidents and automobiles not seeing them,” he said.

The ONE campaign encourages drivers to look left, right and left again for motorcyclists before passing through an intersection. Forty-six percent of fatal multi-vehicle motorcycle collisions from 2006 to 2010 occurred in intersections, according to the National Highway Traffic Safety Administration’s Fatality Analysis Reporting System.

In the city of Seattle, 1,500 motorcycle crashes were recorded between 2007 and 2011, according to the state Department of Transportation. Of those, 710 occurred at intersections. Additionally, the department reported to the Governors Highway Safety Administration 80 fatal motorcycle collisions statewide in the first nine months of 2012 — an increase of 15 deaths from the same period in 2011.