From: cfmpublic@ns.sympatico.ca   
      
   On Wed, 25 Feb 2015 20:44:27 +0100, bob  wrote:   
      
   >> much snipped   
   >   
   >Sure, if you go back through several decades of history, you can find   
   >examples of incidents of vehicle incursion on railway lines.  Meanwhile   
   >this month alone there have been two fatal crashes on crossings with   
   >half barriers and no signal interlocking.   
      
   If you are going to have crossings interlocked with the signals, then   
   the crossing will have to be blocked more than the 20 - 30 second   
   warning time plus actual train crossing time.  The trade off is safer   
   crossings versus larger traffic delay.  I suspect in the North   
   American context, lengthening the delay by 1 - 3 minutes is a   
   non-starter for many or most crossings.   
      
   Clark Morris   
   >   
   >Robin   
      
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