Lens Size

Lens Size

Lens Size 9 inch Lens Size 12 inch

There are two nominal sizes for signal lenses: 8-inch and 12-inch. SDDCTEA recommends using 12-inch lenses in most cases, and always:

  • Where arrow signal indications are used
  • When intersection approach speeds exceed 40 mph
  • Where signals are over 120 feet from the stop line
  • For approaches where signals might be unexpected or sight distance is limited
  • For locations where there is a significant percentage of elderly drivers

All new signal faces shall use 12-inch signal indications except as provided for in MUTCD Section 4D.07.

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