Page 25 of the Rice Signs 2017 Traffic Safety Catalog continues the Warning Signs section with merging, passing, ramp, and hill warning signs. Merging Traffic signs (W4-1 left and right, W4-3 Added Lane, W4-5 Added Lane plaques, W4-6 Lane Reduction) and W9 Lane Reduction signs warn drivers of merging conditions at highway entrances and reduced-lane sections. W1-11, W1-13, and W1-15 ramp and lane-change signs cover entrance and exit ramp geometries. Advisory Speed and Exit Ramp signs (W13-2, W13-3, W13-6, W13-7) provide recommended speeds for curves and ramps. W14-3 No Passing Zone warns drivers approaching passing zones. The Hill and Vertical Grade Signs (W7 series — W7-1 Hill, W7-2P Hill Trucks Use Lower Gear plaque, W7-3 series Steep Grade variants, W7-6) mark steep ascents and descents.