Here are two cute icon sets including 6 retro cars and 6 motorcycles. Free AI (Adobe Illustrator) released by Vitaliy.
Freebies tagged transports
A set including 71 vector shaped transportation icons created with Adobe Illustrator. Free AI file released by Gustavo Cramez.
71 transportation icons PSD
Exclusive
Free PSD transport icons (including bus, cars, flight, bicycle, etc.) designed by Daisy Binks.
Free PSD transport icons
Free PSD travel icons (flights, calendar, luggage, lock, information, tag, et cetera) designed by Konrad.