From: denismfmcmahon@gmail.com   
      
   On Sun, 15 Feb 2015 12:20:08 +0100, bob wrote:   
      
   > Not all crossings in the UK are of this sort, there are also "automatic   
   > half-barrier" crossings ... they are only used on quiet   
   > roads with little traffic, and on railway lines with lower speeds.   
      
   AHB in the UK can be installed on lines up to 100 MPH. That's not "lower   
   speeds".   
      
   --   
   Denis McMahon, denismfmcmahon@gmail.com   
      
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