The New York Public Library just did a vast dump of 200,000 copyright-free images (bless them!) With some extraordinary stuff. They had a huge collection of cigarette cards, which people collected like baseball cards (dad, buy more Ogden's cigarettes, please!). Richard Masoner of Cyclelicious put up a few from a big set on how to be a Boy Scout, which included some on how to be a Boy Scout on a bike.
Living in a city with streetcar tracks all over downtown, I can attest that this is good advice: "cross at as wide an angle as possible." It's the main reason I wear a helmet when I ride in this city, particularly in winter.