37.1 Roundabout Warning Signs (W2-6 and W16-17P).37 903.6.37 Intersection Warning Signs (W2-1 through W2-8) (MUTCD Section 2C.46).36 903.6.36 Advisory Exit and Ramp Speed Signs (W13-2 and W13-3) (MUTCD Section 2C.14).30 903.6.30 Reduced Speed Limit Ahead Signs (W3-5) (MUTCD Section 2C.38).29 903.6.29 Advance Ramp Control Signal Signs (W3-7 and W3-8) (MUTCD Section 2C.37).14 903.6.14 Hill-Related Supplemental Plaques (W7-3 Series) (MUTCD Section 2C.57).11.1 Table 903.6.11 Typical Spacing of Chevron Alignment Signs on Horizontal Curves.9 903.6.9 Combination Horizontal Alignment/Intersection Signs (W1-10 Series) (MUTCD Section 2C.11).8 903.6.8 Combination Horizontal Alignment/Advisory Speed Sign (W1-1a, W1-2a) (MUTCD Section 2C.10).7.7 Table 903.6.7 Horizontal Alignment Sign Usage.7.6 903.6.7.6 ALL LANES Supplemental Plaque (W24-1cP) – Diverging Diamond Interchange (DDI) Application.7.5 903.6.7.5 Double Reverse Curve Left Sign (W24-1L) – Diverging Diamond Interchange (DDI) Application.6.1 Table 903.6.6 Guidelines for Advance Placement of Warning Sign. 6 903.6.6 Placement of Warning Signs (MUTCD Section 2C.05).5.1 Table 903.6.5 Sight Distance Requirements.4.1 Table 903.6.4, Minimum Size of Supplemental Warning Plaques.4 903.6.4 Size of Warning Signs (MUTCD Section 2C.04).3.1 Table 903.6.3 Warning Sign and Plaque Sizes.3 903.6.3 Design of Warning Signs (MUTCD Section 2C.03).2.1 Table 903.6.2 Categories of Warning Signs and Plaques.2 903.6.2 Application of Warning Signs (MUTCD Section 2C.02).1 903.6.1 Function of Warning Signs (MUTCD Section 2C.01).There are of course exceptions to this rule - a pentagonal County Route marker isn't (typically) a greater threat than a standard square route marker, and even though they have only 3 sides, the Yield and No Passing Zone signs are still rather important (and the pennant shape of the NPZ sign serves as a sort of "get back over on your own side of the road" arrow). Then next the octagon shape is used for the Stop sign, since not noticing that sign typically has unpleasant consequences, and so on down the line. infinite number of sides), as a collision between a train and a typical vehicle will nearly always end badly. This is why a circular shape was adopted for the Railroad Advance warning sign (i.e. In general, the greater number of sides on a sign, the more critical a message it conveys. Special shapes are specifically assigned to certain types of signs so that travelers can recognize them quickly and react appropriately. Signs convey information to travelers not only by their messages and color, but through their shape as well.
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