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| − | + | TSI made internal and external controllers. The internal controllers could only be used on the 4-ways. | |
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Traffic Signals Inc. (TSI) was the short-lived successor of Southern Signals and Sargent Sowell. TSI formed in 1960 when Southern Signals changed the names of Southern Signals and Sargent Sowell to Traffic Signals Inc. They were bought by Singer in 1970.
TSI based their 4-ways off of Sargent Sowell's design. All of their signals used Dzus fasteners for latches and the visor collar was wider than most signals.
TSI only made one model of 4-way. They had the option of having an internal controller.
TSI made 8 inch and 12 inch single-face signals. The main difference between the two is that the 12 inch ones have two latches instead of one.
TSI made some pedestrian signals. Not very many of them are known to still be in service and the only ones that are confirmed to be in service are on the NE corner of Marion Street and Market Street in Athens, AL. Here's a list of TSI pedestrian signals that are known to still be in use:
| Location | City, State | # of Signals | Lens Style | Status |
|---|---|---|---|---|
| Market Street and Marion Street | Athens, AL | 2 | Walk/Don't Walk | In use. |
| Kings Highway and Line Avenue | Shreveport, LA | 8 | Walk/Don't Walk | Unknown. |
| Kings Highway and Woodlawn Avenue | Shreveport, LA | 1 | Walk/Don't Walk | Unknown. |
TSI made an 8 inch Wait-walk signal that used the body of an 8 inch signal. None are known to still be in service.
TSI made a 9 inch pedestrian signal that used a 10x12 rectangular door that held the 9 inch lens. The backs of them looked like regular TSI heads except they were more elongated. It is unknown if TSI made any 12 inch pedestrian signals.
TSI made internal and external controllers. The internal controllers could only be used on the 4-ways.
This would include any kind of special options for traffic signals as well as mounting hardware including brackets, slipfitters, hangers, bases, etc.
