Sargent-Sowell Southern Switch Co. also manufactured signals for brands that succeeded the old Southern Autoflows. They started producing Sargent-Sowell signals at the end of the 1950s. Sargent-Sowell signals were popular with communities that were still hanging single 4-way signals and as replacements for preexisting 4-way signals. Many Sargent-Sowell signals were still internally controlled however by this time the timing of light changes had become more precise.

Traffic Signals Inc. (TSI) TSI was another Southern Switch Co. brand that was popular through the 1960s and into the 1970s. Although most communities had switched to adjustable single face signal heads, a few applications were more suited to fixed 4-way signals and these older designs were still popular as replacements for worn out signals in historic districts. The TSI design was very similar to Sargent-Sowell's. Southern Switch still manufactures replacement fixed four-way signals for historic districts through Teeco Safety.

Signals can be repainted for specific set requirements. Many can either be wire hung or adapted for post mounting.
Additional models and designs can be located for specific requirements.

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