Use HL93 design live load as described in Article 3.6.1.2 unless design for a special vehicle is specified or warranted.

Design widenings for existing structures using HL93. Rate existing structures in accordance with the Bridge Inspection Manual. Show load rating and design loads on the bridge plan sheets, for example, HS20 (Existing) HL93 (New).

Do not use the reduction in the multiple presence factor (m) based on Average Daily Truck Traffic (ADTT) on the bridge as suggested in the Article C3.6.1.1.2, Multiple Presence of Live Load.

For simple-span bridges, do not apply the provisions for two design trucks as described in Article 3.6.1.3.1.

Disregard recommendations to investigate negative moment and reactions at interior supports for pairs of the design tandem provided in the commentary to Article 3.6.1.3.1, Application of Design Vehicular Live Loads.

The provisions of Article 3.6.1.1.2 shall not be applied to the extreme limit state when evaluating system redundancy as specified in Chapter 3 – Superstructure Design, Section 17 - System Redundancy Evaluation for Steel Twin Tub Girders.