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Category:902 Signals (MUTCD Part 4): Difference between revisions

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Traffic signals are electrically powered traffic control devices that warn or direct vehicular and pedestrian traffic to take some specific action.  Traffic signals provide for the orderly assignment of right of way to conflicting traffic movements at intersections.
Traffic signals are electrically powered traffic control devices that warn or direct vehicular and pedestrian traffic to take some specific action.  Traffic signals provide for the orderly assignment of right of way to conflicting traffic movements at intersections.


Traffic signals are not a complete solution for traffic problems.  Traffic signals can sometime create additional congestion and cause additional delay to vehicles if improperly designed, installed, or maintained.  Correctly designed and operated traffic signals installed at [[902.3 Traffic Control Signal Needs Studies (MUTCD Chapter 4C)| warranted locations]] will provide for the orderly movement of traffic, increase the intersection capacity, and in some instances, tend to reduce accidents.  [[902.5 Traffic Control Signal Features (MUTCD Chapter 4D)#902.5.5 Coordination|Coordinating]] and [[902.5 Traffic Control Signal Features (MUTCD Chapter 4D)#902.5.36 Signal Timing|timing signals]] are very important.  
Traffic signals are not a complete solution for traffic problems.  Traffic signals can sometimes create additional congestion and cause additional delay to vehicles if improperly designed, installed, or maintained.  Correctly designed and operated traffic signals installed at [[902.3 Traffic Control Signal Needs Studies (MUTCD Chapter 4C)| warranted locations]] will provide for the orderly movement of traffic, increase the intersection capacity, and in some instances, tend to reduce accidents.  [[902.5 Traffic Control Signal Features (MUTCD Chapter 4D)#902.5.5 Coordination|Coordinating]] and [[902.5 Traffic Control Signal Features (MUTCD Chapter 4D)#902.5.36 Signal Timing|timing signals]] are very important.  


Traffic signals are listed on the [[121.3 The Statewide Transportation Improvement Program (STIP)|Statewide Transportation Improvement Program (STIP)]] in the description of the type of improvement if there is a probability of future signal control.  If signals cannot be justified, they are to be eliminated from the program at the earliest possible date.
Traffic signals are listed on the [[121.3 The Statewide Transportation Improvement Program (STIP)|Statewide Transportation Improvement Program (STIP)]] in the description of the type of improvement if there is a probability of future signal control.  If signals cannot be justified, they are to be eliminated from the program at the earliest possible date.
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There are many aspects to be considered when inspecting construction quality and this article provides [[902.19 Construction Inspection Guidelines for Sec 902|construction inspection guidelines]] and [[902.20 Material Inspection for Sec 902|guidelines for material inspections]].
There are many aspects to be considered when inspecting construction quality and this article provides [[902.19 Construction Inspection Guidelines for Sec 902|construction inspection guidelines]] and [[902.20 Material Inspection for Sec 902|guidelines for material inspections]].
===Nonstandard Structures===
{|style="padding: 0.3em; margin-right:7px; border:1px solid #a9a9a9; text-align:center; font-size: 95%; background:#ffddcc" width="210px" align="right"
|-
|'''Adaptive Traffic Signals'''
|-
|[http://library.modot.mo.gov/RDT/reports/Ri08026/or10020.pdf Evaluation of an Adaptive Traffic Signal System:  Route 291 in Lee's Summit]
|-
|'''See also:''' [https://www.modot.org/research-publications Research Publications]
|}
If any traffic signal installation being considered will use a special or nonstandard structure or with dimensions exceeding those shown in the Standard Plans, [http://sharepoint/systemdelivery/tr/Pages/default.aspx Traffic] and [http://sharepoint/systemdelivery/br/pages/default.aspx Bridge] are to be consulted early in the project planning regarding the installation’s feasibility and necessary contract provisions.  Examples of this situation are [[901.7 Light Source and Intensity#901.7.6 High Mast Lighting|signal equipment installed on bridge structures and mast arms]] and exceeding lengths on the Standard Plans.
Since designing details for nonstandard installations is typically performed by an outside engineer employed by the contractor or producer and is certified to MoDOT, the project contract documents must include appropriate requirements about the design standards used.  Since structures beyond MoDOT's standard designs are involved, a performance-based specification of the design signed and sealed by a Missouri Registered Professional Engineer is needed from the contractor.  Certification to the current AASHTO Standard Specifications for Structural Supports for Highway Signs, Luminaries and Traffic Signals including the latest fatigue provisions is required.

Latest revision as of 13:07, 13 October 2025

Traffic signals are electrically powered traffic control devices that warn or direct vehicular and pedestrian traffic to take some specific action. Traffic signals provide for the orderly assignment of right of way to conflicting traffic movements at intersections.

Traffic signals are not a complete solution for traffic problems. Traffic signals can sometimes create additional congestion and cause additional delay to vehicles if improperly designed, installed, or maintained. Correctly designed and operated traffic signals installed at warranted locations will provide for the orderly movement of traffic, increase the intersection capacity, and in some instances, tend to reduce accidents. Coordinating and timing signals are very important.

Traffic signals are listed on the Statewide Transportation Improvement Program (STIP) in the description of the type of improvement if there is a probability of future signal control. If signals cannot be justified, they are to be eliminated from the program at the earliest possible date.

Traffic Pamphlet
Traffic Signals

There are many aspects to be considered when inspecting construction quality and this article provides construction inspection guidelines and guidelines for material inspections.

Articles in "902 Signals (MUTCD Part 4)"

The following 28 pages are in this category, out of 28 total.

9

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