Warmer weather means more two-wheeled vehicles on the roads. Washington Police Chief Greg Goodman says bicycles and motorcycles can be more difficult to see than passenger cars. He's urging drivers to use extra caution. Goodman says bikers can do their part to stay safe as well. He says there is no helmet law on the books in Iowa, or Washington. However, he encourages those who ride to wear one to add another level of protection.