An incorporated municipality may pass a city ordinance restricting the use of a cell phone or features of a cell phone (e.g. texting, emailing, etc.) within their city limits. Municipalities, with Texas Department of Transportation (TxDOT) approval, may install regulatory signs along state maintained roadways (at or near the posted CITY LIMIT signs) that inform motorists of the ordinance. The municipalities are responsible for all costs associated with these signs, including maintenance.