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7 FIGURE 2 AASHTO standard H20 vehicle live load: (top) truck load; (bottom) lane load. evaluation for permit review include "bridge review," LIVE LOAD FACTOR "structure review," "bridge study," "engineering study," "engineering analysis," "engineering evaluation," and "en- In Eq. 1, the live load factor is A2. For example, the AASHTO gineering review." These phrases have all been used by dif- specifications (MCEB 2000) prescribe this factor as 1.3 for ferent states in the responses to the questionnaire, which the operating rating and 2.17 for the inventory rating when the will be discussed later. LFR is used. The operating rating refers to the maximum load level the bridge is allowed to carry. The inventory rating is a It is also important to point out the following issues that load level the bridge is allowed to carry without a time limit have been the focus of discussions regarding bridge evalua- (MCEB 2000). There have been discussions on whether using tion for permit review. They are relevant and possibly attrib- these live load factors for permit review is appropriate, utable to the observed nonuniformity in permit review. because the bridge evaluation for permit focuses on the