Let me give you a little bit of background on a stop sign and a signal light.  This can help you get a better understanding of what a city's criteria and reasoning is when installing traffic signals.

Stop Sign:

• Stop signs are installed to slow down and prevent commuters from using neighborhood roads as a high speed bypasses.
• Overuse of stop signs reduces their effectiveness.

• Signal lights offer the maximum control at an intersection
• Signal lights can increase rear-end collisions, excessive delays and diversion of traffic to residential streets.
• Signal lights cost between $100,000  and $150,000

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