What traffic control devices are

Traffic control devices are the signs, signals, pavement markings and work zone devices that tell drivers what to do and what to expect ahead.

For a device to do its job, a driver has to detect it, read or recognize it, understand what it means, and have enough time to act on it. Human factors research on traffic control devices looks at each step: whether a sign is visible by day and at night, whether its message is legible and understood, and whether it is placed so that drivers have time to respond.

How it bears on driving

When a crash occurs at an intersection, interchange, work zone or other location with signs or markings, a question may arise whether the devices communicated clearly. Sight obstructions, placement, competing information, unfamiliar symbols, temporary work zone layouts and nighttime conditions can all affect whether a message is noticed and understood.

Equally, a device may have been visible and clear, and the analysis may show that a driver had the information needed. The questions are the same either way.

Questions a traffic sign and signal expert witness can address

  • Could the sign, signal or marking be seen and read from the driver's approach?
  • Would a driver unfamiliar with the location reasonably understand what it required?
  • Did the driver have time to perceive, decide and respond?

If a case raises questions like these, the answers depend on its particular facts and evidence. The practice is based in Bryan, Texas, and takes cases in Texas and nationwide. Counsel can begin with a case inquiry.

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This article is general information, not legal advice or an expert opinion on any matter. See the disclaimer.