A car must be between 20 and 40 years old to be a classic, while cars over 45 years fall into the Antique Class. Other factors, including engine displacement, custom coachwork and luxury accessories, such as power brakes, power clutch, and “one-shot” or automatic lubrication systems, help determine whether a car is considered to be a Classic. Drivers of classic cars must be especially careful. Classic cars often lack what are now regarded as basic safety features, such as seat belts, crumple zones or rollover protection.