Safety Belt System:   Are there enough safety belts for everyone?   Can the vehicle's lap/shoulder belt system accommodate children who have outgrown safety seats and booster seats?   Is there enough room -- preferably in the back seat -- to install a child safety seat correctly?   Will the vehicle's seat design interfere with safety seat installation? (Check slope, humps, contours, splits and safety belt anchorages.)   Do safety belts have locking features (locking or switchable retractor) for safety seats?   Are tether anchorages available? (Some vehicle manufacturers can provide retrofit anchorage kits.)   Are adjustable upper belts available?   Are built-in child restraint systems available? Other Important Safety Features:   Head restraint protection for rear seats.   Safety door locks so children cannot open doors from inside vehicle.   Override window controls.