ice cream trucks may also sell snow cones, Italian ice or water ice, snacks, soft drinks, and candy. Many trucks carry a sign, in the shape of a stop sign, that warns other drivers of children crossing the street to buy food or ice cream. They also play music to attract consumers to their trucks. With the advent of social media networking, many ice cream truck operators are redefining the traditional business model. Not satisfied with the traditional approach of cruising for customers, some operators such as gourmet ice cream sandwich maker Coolhaus are developing followings on social media sites and "announcing" the location of their trucks. Novelty vehicles Professionally-built ice cream trucks that sell prepackaged foods are called "novelty trucks". They use commercial cold plate freezers that plug in overnight and when unplugged maintain their temperature for at least 12 hours. Music systems are mechanical, such as melody IC, or more commonly digital soundchips that have no tape or other moving parts. Each "music box" may be able to play one or multiple tunes. See also Ice cream cart Food truck Refrigerator truck References External links Van Vans Restaurants by type Street culture Food trucks