A destination sign (North American English) or destination indicator / blind destination (British English) is a sign mounted on the front, side or rear of a public transport vehicle, Such As a bus , tram / streetcar or light rail vehicle , That Displays the vehicle’s route number and destination. The windshield of a windswept windswept windswept windswept windswept windswept wind , Of the vehicle. Depending on the type of the sign,
Several different kinds of technology-have-been used for destination signs, from single rigid closets Held in place by a gold frame clips to rollsigns , to various kinds of computerized, Electronically controlled signs, Such As flip-dot , LCD or LED displays. All of these can still be found in use today, but most transit-vehicle destinations are now used in North America and Europe are electronic signs. In the USA, the Americans with Disabilities Act of 1990 specify certain design criteria for transit-vehicle destination signs, such as the maximum and minimum character to the visually impaired persons.   In the 2010s, LED signs have replaced flip-dot signs as the most common type of destination sign in new buses and rail transit vehicles. 
For many decades, the most common type of multiple-option destination was the rollsign (or blind bus , curtain sign , destination blind , or tram scroll ) Route name), which is turned by the motor vehicle at the end of the road when reversing direction, either by a hand crank or by holding a switch if the sign is motorized. These Rollsigns were usually made of linen until Mylar (a type of PET film) became the most common material used for them, in the 1960s / 70s. They can also be made of other material, such as Tyvek .
In the 1990s rollsigns were still commonly seen in older public transport vehicles, and were sometimes used in modern vehicles of that time.  Since the 1980s, they have been largely supplanted by electronic signs.  A digital display may be somewhat less readable, but is easier to change between routes and destinations. However, given the long life of public transit vehicles and of signs rolls, if well made, some transit systems continue to use these devices in the 2010s.
The roll is attached to metal tubes at the top and bottom, and flanges at the ends of the tubes are inserted into a mechanism which controls the rolling of the sign. The upper and lower rollers are positioned sufficiently close to a full “reading” (a destination or route name) to be displayed, and a strip light is located behind the blind to illuminate it at night.
When the display is changed, the driver / operator / conductor turns a handle / crank -or holds a switch if the sign mechanism is motorized-which engages one roller to hold the blind and disengages the other found. A small viewing window in the backside of the signbox (the compartment housing sign) permits the driver to see an indication of what is being shown on the exterior.
Automatic changing of rollsign / blind displays, through electronic control, has-been possible, since at least the 1970s, goal is an option That Primarily has-been used is systems-where rail has metro rail or articulated tram can-have Several separate signboxes each-and only Infrequently on buses, where it is comparatively easy for the driver to change the display. These signs are controlled by a computer in the driver’s cabin. Barcodes are printed on the reverse of the blind, and as a result of the barcodes until reaching the code for the requested display. The on-board computer is normally programmed with information on the order of the displays, And can be programmed using the non-volatile memory should the blind / roll be changed. However, these are not the only ones to be able to read the markings. For buses, this disadvantage is outweighed by the need (compared to manual) to change each destination separately; If changing routes, this could be up to seven different blinds. Automatic-setting rollsigns are common on many light rail and subway systems in North America. Most Transport for London buses use a standard system with up and down buttons to change the destination shown on the blinds and a manual override using a crank. The blind system is integrated with a system controlling announcements and passenger information, which uses satellites to download stop data in a sequential order. It uses GPS to determine what to stop, and announce the next stop.
In the United States, the first electronic devices for buses were developed by Luminator in the mid-1970s  and became available to transit operators in the late 1970s, but did not become common until the 1980s. These were flip-disc, or “flip-dot”, displays. Some transit systems still use these today.
Another technology That has-been employed for destination signs is the split-flap display , gold Solari display, purpose outside Italy , this technology Was never common for use in transit vehicles. Such displays were more often used at transit hubs to indicate arrival and departure information.
Most present-day destination indicator signs Consist of liquid crystal display (LCD) or light-emitting diode (LED) panels That can show animated text, colors (in the case of LED signs), and has Potentially unlimited number of roads (long n As they are programmed into the vehicle ‘s sign controller unit; some sign controller units may also allow the driver to write the route number and the destination through a keypad if required). In many systems, the vehicle has three integrated signs in the system, the front sign on the windshield, the side sign on the passenger entrance, both showing the road number and destination. An internal sign, which could also provide different kinds of information such as the current stop and the next one,
Some of the features of the GPS system , such as GPS , serial interfaces and a vehicle tracking system . 
- Platform display
- ^ Jump up to:a b c d “Sign of the Times: Transit signs have evolved from curtain signs to the first electronic sign by the Luminator to the present ADA-regulated visual and audio signs”. Mass Transit magazine, January-February 1993, p. 30-32. Fort Atkinson, WI (USA): Cygnus Publishing . ISSN 0364-3484.
- Jump up^ Destination and road signs(guidelines for), Section 39 WithinPart 38(Accessibility Specifications for Transportation Vehicles) of the USAmericans with Disabilities Act of 1990.
- ^ Jump up to:a b Tucker, Joanne (September 2011). “The Wireless Age for Digital Destination Signage Arrives” . Metro Magazine . Retrieved 2014-11-21 .