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Traffic Signal Systems
Flashing Yellow ArrowsFlashing Yellow Arrow Signals
The City of Sugar Land introduced the Flashing Yellow Arrow (FYA) left-turn signal in Spring 2010.

  • The FYA indication replaced several protected green arrow left turns, and helped to reduce delay and wait time by as much as 28 percent on major thoroughfares.
  • There are 35 traffic signals that have FYA indications on one or more left-turn movements at the signal.
  • The FYA signal is disabled when school zones are active and during the walk phase for a pedestrian crossing at a signal.

In order for a signal to be considered as a FYA candidate, the traffic signal and roadway approaches must meet the following criteria:

  • Vehicle paths cannot cross each other on opposing left turns.
  • There must be adequate sight distance for the left turn movement.
  • The posted speed limit must be 45 mph or less.

Traffic SignalsRefer to the Flashing Yellow Arrows Brochure for more details.

Pedestrian Signals
For all traffic signals in Sugar Land, there are pedestrian signals located on the crosswalks at the traffic signal. These pedestrian signals are based on the latest TxDOT countdown module (which has three parts for pedestrian crossings).

  • First Phase - white WALK indication that normally provides 4 to 7 seconds for pedestrians to leave the curb and start crossing the street.

  • Second Phase - orange DON’T WALK indication, which informs pedestrians whom are at the curb to not enter the crosswalk (since there will not be enough time to cross).

  • Third Phase - a countdown timer will begin, which notifies pedestrians of how many seconds remain to clear the crosswalk.

      Signal Detection Systems

      Traffic CameraTraffic signals use vehicle detection systems which allocate signal timing based on vehicles arriving at the signal. For example, when a vehicle approaches a signal from the side street, the signal system detects it and provides signal timing to this street approach.

      The city currently uses two forms of signal detection: inductive loops that are installed in the approach lanes, and camera detection that is placed on the signal arms. Both loops and cameras establish zones that measure the presence of a vehicle and the amount of time the vehicle occupies the zone.

      Corridor Signal Synchronization
      Traffic signal synchronization is helpful when there is a high number of vehicles traveling along a roadway corridor and are stopping at several signal lights. Signal synchronization improves traffic flow on main corridor direction, but can cause longer delays for left-turning and side street traffic. Therefore, signal timing is calculated so that the signals can turn green before the vehicle group arrives,
      and delay is reduced for all intersection approaches.

      Synchronization has been implemented in the major corridors listed below. Travel time analyses are conducted throughout the year to maintain synchronization.

      • SH 6 (Brooks Street – Frost Pass)
      • US 90A (Dairy Ashford – Easton Avenue)
      • Sweetwater Boulevard (Alcorn Oaks – First Colony & Colony Square)
      • Williams Trace (SH 6 – US 59)

      Map of CorridorsS

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