Section 4: Advisory Speeds

Advisory Speed Sign

An Advisory Speed sign (W13-1) is added to a warning sign to advise motorists that a speed lower than the speed limit should be considered. The use of this sign is discussed in the (TMUTCD) and in .
The Advisory Speed sign should not be used by itself; it should only be used as a supplement to warning signs for:
  • curves and turns (W1-1, W1-2, W1-3, W1-4, W1-5, W1-10 series, W1-11, W1-13 and W1-15) (see the following subsection)
  • intersections (W2-1 through W2-8)
  • narrow and one-lane bridges (W5-2 and W5-3)
  • BUMP (W8-1) or DIP (W8-2)
  • descending grades (hills) steeper than 5 percent (W7-1 and W7-1a)
  • temporary traffic control zones
  • other conditions, as necessary.
These warning signs and their uses are discussed in the TMUTCD and the Procedures for Establishing Speed Zones manual.

Curve Symbol

The Curve Symbol sign (W1-2) should have an advisory speed plaque. Advisory speed for the plaque should be determined as described in .

Turn Symbol

The Turn Symbol sign (W1-1) should have an advisory speed plaque. This sign should be used for turns which have recommended speeds between five and 30 miles per hour.

Advisory Exit Speed Sign

The independently mounted Advisory Exit and Ramp Speed signs (W13-2, W13-3, W13-6 and W13-7) are used to display the maximum recommended speed on expressway and freeway exit ramps. These signs are discussed in the TMUTCD. discusses procedures for determining and posting these signs.