Twenties providers

This time we are looking on the crossword puzzle clue for: Twenties providers.
it’s A 18 letters crossword definition.
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Possible Answers:

ATMS.

Last seen on: Wall Street Journal Crossword – January 18 2020 – Singular Songsters

Random information on the term “ATMS”:

A variable- (also changeable-, electronic-, or dynamic-) message sign, often abbreviated VMS, CMS, or DMS, and in the UK known as a matrix sign,is an electronic traffic sign often used on roadways to give travellers information about special events. Such signs warn of traffic congestion, accidents, incidents such as terrorist attacks, AMBER/Silver/Blue Alerts, roadwork zones, or speed limits on a specific highway segment. In urban areas, VMS are used within parking guidance and information systems to guide drivers to available car parking spaces. They may also ask vehicles to take alternative routes, limit travel speed, warn of duration and location of the incidents, or just inform of the traffic conditions.

VMS’s were deployed at least as early as the 1950s on the New Jersey Turnpike. The NJ Turnpike’s signs of that period, and up to around 2012, were capable of displaying a few messages in neon, all oriented around warning drivers to slow down: “REDUCE SPEED”, followed by a warning of either construction, accident, congestion, ice, snow, or fog at a certain distance ahead. The New Jersey Turnpike Authority replaced those signs (along with 1990s-vintage dot-matrix VMS’s along the Garden State Parkway) with more flexible electronic signs between 2010 and 2016.

ATMS on Wikipedia