The MBE lane-type legal load model contains a truck and a lane load (MBE Appendix D6A). The model applies for the following two cases:
1. Spans greater than 200 feet for all load effects. The live load type for this case is truck + lane.
2. Negative moment and interior reactions for all span lengths. The live load type for this case is truck pair + lane. The legal pair check box in the Analysis Setting/Vehicle Properties window must be checked for this case.