Measure to be sure of your exact travelling height. If your height is close to the posted clearance, use caution. That sign may not be accurate. I remember one instance years ago that a 13'0" truck got stuck under a bridge posted as 13'5". years of road repairs and resurfacing added an extra 6 inches of asphalt to the road surface. The clearance sign was never changed until after they removed the truck and remeasured. and another instance but the reverse. Sign says low clearance 13'6" in right lane. The bridge was completely replaced about 2 years ago with a new structure with about 16' of more of clearance. The sign is still there.
If in doubt, check it visually.
Ken