Pet hair is more of a problem in cars with cloth seats. Draping the seat with a towel or sheet is the easiest way to prevent hair from working its way into the seat. If practical, keep your pet in a carrier when traveling in the car. It's safer and prevents shedding in the vehicle. Hand-held interior car vacuums are good at getting into cracks and crevices. Wipe down cloth interiors with a damp towel and use a pet hair roller.
If pet hair is still a problem, consider breeds that shed less than others. Poodles, Bedlington terriers and Maltese make the pet hair issue easier but still require regular grooming. Still can't deal with pet hair? How about hairless breeds such as the Mexican Hairless or Chinese Crested.