FAQ #26<BR>
How can I apply both permit loading and HL93 loading at the same time?
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  Rating tables when both HL93 and permit loading are applied are generated according to conditions used as following in girder system input:
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1.  Default is where only HL93 and PRMITP data supplied with no conditions concerning permit loading.  In this case two rating tables are generated for the HL93 truck (Strength I and Service II), and two rating tables for the permit truck (Strength II and Service II) as if the two types of loads are applied independently.  HL93 is considered in all lanes and the permit vehicle is only in the critical lane.  Multipresence is applied only to the HL93 loading.
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2. In a special type of run where the HL93 and permit trucks are considered in combination for Service live loading (with the condition PERMIT TRUCK IS ONLY LOADING IN PERMIT LANE) it is assumed the two loads are applied simultaneously.  The first rating table is for the simultaneous effect of permit and HL93 loading.  It is labeled as "HL93+Permit" instead of Strength I, and the second table is a Service II rating for the combination of HL93 and the permit truck. A third rating table is generated for permit loading only and is labeled Strength II.  Multipresence is applied only to the HL93 loaded lanes in this type of run because the permit truck is always assumed to be in the most critical lane and the HL-93 is always assumed to be in the second most critical lane (and considered in the 3rd, 4th lanes, etc.)  The result is that in this type of run where HL93 is combined with permit loading the case of only one loaded lane is not considered.
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3. A third case involves using the condition PERMIT TRUCK IN ALL LANES, which generates a Strength I and a Service II rating table for HL93 loading only, and a Strength II and a Service II rating table for permit truck loading only.  Multipresence is applied separately both to the HL93 loading and the permit loading. 
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4.  If permit loading is the only loading to be applied, the conditions PERMIT TRUCK IN ALL LANES and PERMIT TRUCK IS ONLY LOADING IN PERMIT LANE effectively exclude the HL93 loading. Only rating tables labeled Strength II and Service II are generated.  Multipresence is applied.
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5.  If wheel distribution is used as loading the permit vehicle is applied only to the girder for which effects are being determined.
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ADDITIONAL OPTIONS:
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PBETA can be used to specify the load factor for the permit vehicle.
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Also, the conditions OVERLAY PERMIT TRUCK WITH LANE LOADING and INCLUDE LANE LOADING IN PERMIT TRUCK FOOTPRINT can be used for 
applying lane loading (PRLANE) accompanying a permit truck.
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And you can Search the online help for "permit" to find other relevant conditions, such as:<br>
TWO PERMIT TRUCKS STRADDLING PIER<BR>
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OPTIONS FOR APPLYING PERMIT VEHICLES IN LINE GIRDER PROJECTS ARE MORE LIMITED:
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1. In line girder projects when running a permit truck and a design truck you simply get separate results for each truck.  Because line girder projects involve live load distribution factors, the distribution factor simply gets applied to the trucks and lane loading. (the only way to consider the permit vehicle in one lane is as described in 2. below.)
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2. The only way to run a permit truck alone is by factoring down the design truck with
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TFACT .001<BR>
LFACT .001<BR>
TFACTT .001<BR>
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and then, if you want to consider the permit vehicle in only one lane, you can also specify the live load distribution factor accordingly (with LANEM, LANEMF, LANEV, LANEVF, LANED lane fractions for LRFD, or WHEELS, WHEELD, WHEELR, WHEELF wheel distribution factors for LFD.)
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