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Need simple quick way to estimate modal splits

taxpayer

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In a particular place we have a problem whereby transit service is delayed for unpredictable periods. I want to make a guess as to the effect on ridership if the delays could be reduced. What I'm looking for is a simple modal split model, that wouldn't require too many other assumptions. I recall once upon a time having seen such things in some TRB publication, but I haven't been able to find it. Any suggestions?

--Chuck Metalitz
Transit Riders' Authority
 
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Take a look at elasticity models to estimate changes in ridership when one variable changes. You need to be careful in selecting the source of the elasticity factors but it is a very quick way of getting an estimate of changes in transit use when service characteristics change. The source that I turned to was the Canadian Transit Handbook, 2nd Edition. It was published in 1985 and may have been updated since then.
 
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