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W = 500(LN/N-1 + 12N + 36) W = Overall gross weight on any group of 2 or more consecutive axles to the nearest 500 pounds. L = Distance in feet between the extreme of any group of 2 or more consecutive axles. N = Number of axles in the group under consideration.

Bridges are typically posted with a weight restriction because a structural member(s) within the bridge has succumb to deterioration resulting in a reduction of that members structural capacity to carry the pre-design loads. In most instances, bridges are weight restricted for the deterioration of a bridge beam.

The bridge formula is: W = 500 ((LN/(N-1)) + 12N + 36). W = the overall gross weight of any two or more consecutive axles to the nearest 500 lbs. L = the distance (in feet) between the outer axles in a group of two or more axles. N = the number of axles in the group.

Bridge Formula Application to Single-Unit Trucks With these restrictions satisfied, a check is done for Bridge Formula requirements, axles 1 through 4. Actual weight = 12,000 + 15,000 + 15,000 + 15,000 = 57,000 pounds. Maximum weight (W) = 57,500 pounds (Bridge Table for "L" of 23 feet and "N" of 4 axles).

You can write validation rule on Formula field. It will work. If your formula violates the validation, then validation rule will fire. But you cannot show validation message at particular field, only at top of the page.

Crossing a bridge in a vehicle that exceeds the weight limit can damage both the bridge and your vehicle, meaning you or other bridge users may not be able to cross safely. If your vehicle damages a bridge, you may be held liable for the cost of repair.

What Is It? Congress enacted the Bridge Formula in 1975 to limit the weight-to-length ratio of a vehicle crossing a bridge. This is accomplished either by spreading weight over additional axles or by increasing the distance between axles.