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AASHTO Lane Loads

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I just got the 16th Ed. AASHTO spec and I'm not clear what a lane load is
exactly. states, "lane loads ... are equivalent to truck trains."

However reads, "For continuous spans, the lane loading shall be
continuous or discontinuous; only one standard H or HS truck per lane shall
be considered on the structure."

Does "lane load" mean something different here?  If not, how can a lane load
represent a train of trucks yet be used when considering only that one is on
the structure?

Ed Fasula