Half a croissant, on a plate, with a sign in front of it saying '50c'
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Heave Comp Pontoon Bridge

It Puts You Neither Up Nor Down
 
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Pontoon bridge is fitted with hydraulic rams between the pontoon and the brdge deck and a reference system (clump weight/wire) running from the pontoon to the river bed. Pontoons are fitted with tidal turbines. Power from the turbines is used to move the rams up and down, conmpensating for the movement of the pontoons, keeping the road level. Surplus power is sent to the national grid. Elegant. Excellent.
Harry Mudd, Aug 17 2007

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       Excessive.
baconbrain, Aug 17 2007
  

       I had been contemplating a trampoline bridge...
xandram, Aug 17 2007
  

       Egotistical,   

       decent otherwise. You don't need a wire going to the riverbed though: extension of the road surface from the pontoon versus pontoon depth in the river, works.
FlyingToaster, Apr 26 2014
  

       Simpler, shirley, to have GPS sensors on the bridge to instruct the compensating rams? Or simpler still to simply not put the river under the bridge in the first place.
MaxwellBuchanan, Apr 26 2014
  

       To be honest, it doesn't actually mention a river, closest is "river bed" on line 3.
not_morrison_rm, Apr 26 2014
  
      
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