Content Comparison

...

Lane Width: The combined width of the vehicle (usually 6 ft) and its margin (1 or 2 feet) should not exceed the Lane Width, which is typically 12 ft.

...

Margin btw. Vehicle & Lane Edge : This is referring to the lateral distance from both sides of the lane where vehicles cannot be placed. The wheel load of any vehicle cannot be positioned in this specific location.

Image Added

Vehicles

It is utilized to define a vehicle, vehicle's impact factor and direction within a single Design Lane in the longitudinal direction. Typically, AASHTO recommends placing one or two vehicles in the longitudinal direction within a single lane. Using the vehicle 1, vehicle 2, vehicle 3, and vehicle 4 parameters, OpenBrIM allows users to position up to four vehicles in the Design Lane's longitudinal direction. It should be noted that this does not apply to the placement of the Design Lane in the transverse direction, which is determined by the roadway width and design lane width.

Vehicle 1: The vehicles defined in the "Vehicles" section are assigned to the parameter that specifies the vehicle to be positioned within the Design Lane. This represents the first vehicle defined in the longitudinal direction.

Vehicle 1 Impact Factor: According to AASHTO Table 3.6.2.1.1, the dynamic allowance factor is indicated as 75% for Deck Joints - All Limit States, 15% for All Other Components, Fatigue and Fracture Limit State, and 33% for other limit states. In OpenBrIM, this information is used to specify the impact factor as 1.75, 1.15, and 1.33, respectively. This parameter increases the vehicle's wheel loads using the specified factors.

Vehicle 1 Direction[Both/Backward/Forward]: In the context of a vehicle, x=0 is considered to be the location of the front of the vehicle in vehicle definition. Moving in the forward direction means increasing alignment station values, while moving in the opposite direction is considered backward. If "both" is chosen, placement is carried out in both forward and backward directions, but only the critical placement is reported. According to AASHTO guidelines, using both directions is generally recommended, but for permit trucks with unique circumstances, it may be acceptable to use only one direction.

Vehicle 2:

Vehicle 2 Impact Factor:

...

Lane Placement Settings

Apply Lane Constraint[Yes/No]:Lane placement constraints are implemented to prevent the placement of lanes in a specific section of the roadway perpendicular to the direction of travel. If "yes" is selected, and the start and end parameters for the constraint are entered, the placement of lanes will be prevented in that section. For instance, if the roadway has a width of 48 feet, and no lane placement is permitted between 20 and 28 feet, the lanes will only be placed between 0-20 feet and 28-48 feet.

Lane Constraint Start [ft]:need screenshots - and don’t how it really works

Lane Constraint End [ft]: