Southwest Signal Supply, Inc. maintains traffic signal intersections on an as needed basis or with a contract. Upon a call of trouble we respond to emergency calls in no later than four hours. If a malfunction occurs after hours we have a 24 hour number that is answered by our answering service that dispatches the call to our service technician on duty. Our invoices are itemized for each service call made with dates, times, reported by name, problem reported, work performed, and material used. Contact us for our hourly maintenance rates.