In an effort to help standardize warning signs for motorcycle safety and help reduce the number of motorcycle crashes at intersections involving other vehicles, Allstate Insurance Company has announced plans to permanently install motorcycle warning signs in more than 30 U.S. cities this year. Currently, there is no standard sign for motorcycle awareness.

The yellow, diamond shaped warning sign was created following two years of development, which included 140 temporary installations in various U.S. cities between 2010 and 2011. The signs were designed to establish a standardized warning device that can be used by any local or state agency and would be recognizable to riders and motorists across the country. Simply reading, "Watch for Motorcycles," the sign was developed by Allstate as part of its "Once is Never Enough" (ONE) program – an awareness campaign that encourages people to look twice for motorcycles at intersections.

"Allstate set out to create a standardized warning sign to help increase motorcycle safety at dangerous intersections," said Keith Rutman, vice president of Allstate's consumer household unit. "As more and more of the 'Watch for Motorcycles' signs are installed across the country, we hope that riders and motorists will familiarize themselves with the message and remember to always look twice at intersections, because once is never enough."

According to the National Highway Traffic Safety Administration, 46 percent of all multi-vehicle crashes occur at intersections, oftentimes as a result of a vehicle turning left, impeding the motorcyclist's right-of-way.

"Every day in the U.S., an average of three motorcyclists are killed at intersections in crashes that involve other vehicles, and that's unacceptable," Rutman said.

Through its ONE program, Allstate works with local traffic authorities to identify dangerous intersections for riders and then donates and installs warning signs at the determined locations to increase awareness of motorcycles.

Allstate is also encouraging people throughout the month of May to take the ONE Pledge – committing to look twice for motorcycles at intersections – and share with at least ONE other person to spread the message. For every pledge shared, Allstate will donate ONE dollar toward the creation and installation of more "Watch for Motorcycles" signs at dangerous intersections across the country.