Large trucks pose a unique threat to other motorists, as their large size prevents them from reacting to road conditions as quickly as commuter vehicles. For example, drivers of large trucks have problems halting abruptly and must often deal with massive blind spots, which may prevent them from seeing other nearby drivers. Large trucks are also prone to jackknifing, which occurs when a truck comes to a sudden stop—usually on a slick or uneven surface—and the trailer of the truck becomes parallel to the cabin. The trailer may then hit cars in adjacent lanes and cause widespread damage.