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Here is a rather ponderous summation of an elaborate new system, including the application and the reasoning.  Looks like lots of new ideas short of grade separation for both signalized and non-signalized crossings.  And this is not really that new, being released in 2005: <a href="http://www.dot.state.mn.us/guidestar/2001_2005/hri/HRI_Evaluation_Report_Final.pdf">http://www.dot.state.mn.us/guidestar/2001_2005/hri/HRI_Evaluation_Report_Final.pdf</a> Grade separation is the perfect solution, but the cost holds it back.  Cost is also holding back the signalization of non-signalized crossings.  The cost of that latter holds out the possibility that a low-cost substitute for full signalization can be found.  Lots of people are looking for that solution, but the challenge in achieving suitable reliabilty for such a system is daunting.  The cost of grade separation as a solution, while perfect, does not hold out the promise of some revolutionary way to get it accomplished for low cost.  I wonder what a simple highway overpass would cost, for example, at the site of the Nevada crash.  Basically, you need a highway overpass and two filled ramps.  Probably would also need a shoefly for the highway while the new work is done. Speaking of active advance warning (in the other thread), that will soon be inside of your car.
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