North Dakota Truck Weight Education
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NDLTAP truck weight expert Leanna Emmer described the new on-line Truck Weight Calculator Dec. 8 at the Associated General Contractors of North Dakota Annual Convention in Fargo. Emmer reviewed ND Legal Weight limits for trucks and introduced the web-based ND Truck Weight Calculator that was launched in September.
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North Dakota Truck Weight Education
- 1. ND Truck Weight Education Leanna Emmer, NDLTAP Technical Resource Representative
- 3. Legal Gross Vehicle Weight State Highway System • 105,500 pounds • Unless otherwise posted Local Road System • 80,000 pounds • Unless designated otherwise Interstate System • 80,000 pounds • With interstate permit, up to 105,500 pounds
- 4. Axle Configuration • Single Axle – Up to 20,000 pounds • Number of tires/axle
- 5. Axle Configuration • Tandem Axle – Up to 34,000 pounds • Up to 19,000 pounds/axle-state/local roads • Up to 17,000 pounds/axle-interstate system > 40 inches < 8 feet
- 6. Axle Configuration • Group of 3 or more axles – Up to 48,000 pounds – state/local roads • Up to 19,000 pounds/axle – Determined by bridge length – interstate system • Up to 17,000 pounds/axle > 40 inches > 40 inches
- 7. Tire Width – Linear and Metric
- 8. Tire Width • 550 pounds per inch of tire width – Number of tires per axle • 550 x 2 tires x 11” tire width = 12,100 pounds • 550 x 4 tires x 11” tire width = 20,000 pounds
- 9. Exception Steering Axle •Axle Rating •Interstate System •Up to 20,000 pounds
- 10. North Dakota Axle Weight Limitations - Tire Width
- 11. Bridge Length – Federal Bridge Formula Measurement from axle center to axle center Used to determine allowable gross weight on an axle group(s) and vehicle/vehicle combination On interstate system • Interior and exterior bridge length are used to determine gross vehicle weight On state/local roads • Exterior bridge length is used to determine gross vehicle weight
- 12. Bridge Length – Interstate System 12’9” 4’5” 41’1” 4’6” 4’3” 8’9” 17’4” 54’3” 67’
- 13. Bridge Length – State/Local Roads 12’9” 4’5” 41’1” 4’6” 4’3” 67’
- 15. Elements – Axle/Gross Weights State/Federal Law • Number of Tires/Axle Axle Configuration • Steering axle rating, interstate Tire Width • Distance axle center to consecutive axle center Bridge Length
- 17. http://dotsc.ugpti.ndsu.nodak.edu/TWC/ ND Truck Weight Calculator
- 18. QUESTIONS? ND Local Technical Assistance Program Leanna.emmer@ndsu.edu (701)328-9855
Editor's Notes
- With the current axle configuration under your vehicle, how much weight can the vehicle legally gross? If you added additional axles or increased the distance between axles would that increase that vehicles carrying capacity...increase the amount of product your vehicle can legally gross? Today, we are going to review the legal axle weight and gross vehicle weight limits allowed on a truck-tractor semitrailers traveling on ND’s roadway system. We will cover what elements are used to determine the legal weight limits on a vehicle combination. Go Live. Introduce the on-line ND Truck Weight Calculator. The on-line truck weight calculator was created to enable a user – a motor carrier, government officials, law enforcement - to more easily determine legal weight allowed on their truck-tractor semitrailer when traveling on roadways in the state of North Dakota. It was created so a user could more easily determine if they were able to increase their vehicles weight capacity by adding additional axles or increasing distance between axles.
- Vehicle Axle weights and gross vehicle weights for ND highway system are set by law. Factors looked at when determining the legal gross vehicle weight of a vehicle combination are the axle configuration, tire width, and bridge length - measurements between axles and axle groups .
- Laws – set the maximum legal axle weight limits and gross vehicle weight limits for North Dakota’s road system. ****(screen) When determining legal weights on a vehicle combination, the factors used for the state/local road system are slightly different than the factors used for the interstate system.
- Axle configuration is factor is determining allowable weight on a vehicle combination. Single axle, tandem axle, triple axle, split axle Maximum weight on a single axle – up to 20,000 pounds What defines a single axle.... Measurement from axle center to the center of the next axle is 8 feet or more. Number of tires is also a determining factor - 2 or 4 tires. Increasing the number of axles under a vehicle configuration, may increase GVW limit allowed for that particular vehicle
- Tandem axle is legal up- 34,000 lbs What is a tandem axle??? 2 consecutive axles that have a distance of more than 40 inches but less than 8 feet from hub center to hub center.
- Group of 3 axles, group of 4 axles….legal GVW on state/local roads – up to 48,000 pounds On the interstate system, determined by distance in feet/inches from the center of the 1st to the center of the last axle in a group For state, local and interstate system, require more than 40 inches from axle center to axle center in order for each axle to be recognized as an individual axle.
- Tire width is a factor in determining legal weight on an axle Tire width from the manufacturer’s reading on the tire sidewall. No tire can exceed 550 pounds per inch of tire width – weight calculator does the calculation The greater the tire width, the more weight allowed, not to exceed the gross axle weight caps set by state law. There is an exception
- Number of tires per axle is also a factor.
- When travel is on the interstate system, the weight allowed on the steering axle is determined by the manufacturer’s axle raring. The axle weight rating is stamped on a plate, which is generally found on the inside driver door panel or inside the driver’s step. Typically the axle rating ranges from 12,000 to 20,000 pounds. It is dependant on the vehicle...what that vehicle is being used for...heavy haul, over the road, etc
- Axle weight limitations chart show maximum legal axle weights based on 550 pounds per inch of tire width calculation
- Bridge length is also a factor in determining legal gross weight on axle groups, combination of axle groups and the GVW What is bridge length....start out by looking at the measurement from axle center to consecutive axle center These distances from axle center to axle center are used to determine bridge lengths. Bridge length is the measurement from the center of the first axle in a group to the center of the rearmost axle in that same group. Bridge length is the measurement from the center of the first axle in a group of axles to the center of the rearmost axle in the next group. Bridge length is the measurement from the center of the first axle to the last axle of a vehicle combination.
- Established when a vehicle is traveling on the interstate system, must comply with interior and exterior bridge length Start out by looking at the distance from axle center to consecutive axle center These distances from axle center to axle center are used to determine bridge lengths. Examples of interior bridge lengths Measurement of 8’9” from the center of the first axle in a group to the center of the rearmost axle in that same group. Chart shows 8’9” = 43,000 Measurement of 17’4” from the center of the first axle in a group of axles to the center of the rearmost axle in the next group. Steering axle to center of last drive axle 17’4 = 49,000 lbs. Or 54’3” is an interior bridge length It is also the measurement from the center of the first axle to the last axle of a vehicle combination, exterior bridge length of 67’ = 94,000 lbs By increasing the distance between axle groups, or increasing the number of axles under a vehicle....MAY increase gross vehicle weight allowed on a vehicle combination.
- On state/local road system, vehicles must comply with exterior bridge length....measurement from the center axle on a tractor to the center of the rearmost axle on a trailer. Start out by looking at the distance from axle center to consecutive axle center. Calculator will add those measurement to come up with exterior bridge length for this vehicle combination By increasing the measurement between axle groups, may increase gross vehicle weight allowed on a vehicle combination.
- Weight limitations chart.... Row at the top shows number of axles in consideration. Left column measurement in feet to be considered...... Ex: Bridge length measurement is used to determine gross weight allowed on a group of axles...3 axles 8 ft = 42,000 Bridge length measurement is used to determine gross weight allowed on 2 or more axle groups. 5 axle...46 ft = 77,000 lbs. Bridge length is measurement is used to determine gross vehicle weight of a vehicle or vehicle combination
- So when I worked for the ND Highway Patrol, a carrier would come into the office or I would visit with them on the phone. Want to know how much weight their vehicle could legal gross. I would get a piece of paper and start asking questions Axle configuration – 5 axle Tire width, - generally went with the standard 11” tire Number of tires per axle
- Plug the numbers from all our elements into the on-line truck weight calculator, it will automatically produce legal axle weights, gross vehicle weight allowed on a vehicle combination. Can access and use the On-line truck weight calculator on your Smartphone and I-pad or laptop Go Live!!!!