Which statement best describes the bridge formula's effect on axle weight?

Which statement best describes the bridge formula's effect on axle weight?

• A. It sets the speed limit for heavy loads
• B. It permits less maximum axle weight for axles that are close together
• C. It applies only to buses
• D. It increases maximum weight when axles are widely spaced

Answer: (B)

The Bridge Formula determines how much weight can be carried on a group of axles based on how far apart the outermost axles are. If the axles are close together, the same load would be concentrated over a shorter distance, so the formula lowers the allowable weight to protect bridges. If the axles are spread farther apart, the load is distributed over a longer span, allowing more weight. So, the statement that it permits less maximum axle weight for axles that are close together is the best description. This isn’t about speed limits, isn’t restricted to buses, and isn’t simply about increasing weight when spacing grows; it’s about how axle spacing directly influences the maximum permitted weight.

The Bridge Formula determines how much weight can be carried on a group of axles based on how far apart the outermost axles are. If the axles are close together, the same load would be concentrated over a shorter distance, so the formula lowers the allowable weight to protect bridges. If the axles are spread farther apart, the load is distributed over a longer span, allowing more weight. So, the statement that it permits less maximum axle weight for axles that are close together is the best description. This isn’t about speed limits, isn’t restricted to buses, and isn’t simply about increasing weight when spacing grows; it’s about how axle spacing directly influences the maximum permitted weight.