Regulatory signs include stop signs, speed limit signs, and parking signs.

• These signs are mandated by law to be obeyed.
  
  
• Disobedience of these traffic signs is punishable by a fine.
  
  
• When these signs are posted within a construction work zone, traffic fines may be doubled.
  
  
• Regulatory signs are installed based on TxMUTCD guidelines and engineering studies.

Warning signs are installed to warn drivers of a possible unexpected change in driving conditions.

• Curve ahead, merge signage, divided highway, and dead end signs are examples of warning signs.
  
  
• Warning signs are installed based on TxMUTCD guidelines and engineering studies.

Construction signs are encountered on a regular basis.

• Construction signs can be installed for a short duration such as the repair of a pothole or for a long duration (i.e. construction of the President George Bush Turnpike).
  
  
• Contractors who operate within the City of Carrollton are obligated to provide a traffic control plan to the City of Carrollton.
  
  
  • The traffic control plan indicates how they intend to handle traffic during their operation and which construction signs they intend to use.
    
    
• The TxMUTCD Part VI details the various components of traffic control plans and the available signs.

Guide signs can be blue and white, brown and white, or green and white.

The color of the sign indicates to the driver the content and purpose of the sign. Guide signs are installed after careful consideration. It would be very easy to saturate drivers with too many signs. 

• White on green guide signs are directional. They provide distances to a location (i.e. Dallas 24 miles), street identification (i.e. Josey Lane and Jackson Road) or exit guidance (i.e. Sandy Lake Drive Next Exit).
  
  
• White on brown guide signs are used to identify recreational and cultural interest sites. For example, the signs can indicate direction to the Perry Homestead or Swimming facilities.
  
  
• White on blue guide signs are used to tell the driver of general motorist services. These signs indicate the location of food and lodging, rest areas, or hospital care.

The TxMUTCD and engineering studies are used to determine appropriate guide sign placement.

School signs are installed adjacent to educational facilities.

• These facilities might be an elementary, junior high, or high school.
  
  
• They could also be installed adjacent to a university or an alternative education center.
  
  
• In the past few years, the City of Carrollton has installed the brighter fluorescent yellow-green signage.
  
  
• This special material has a very high reflectively and has been shown to increase driver awareness - particularly around schools.