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Speed humps

Speed humps

Speed humps

(OP)
Is there a specific technical reason of putting humps (road speed humps) on bridges approaches? I was driving on one trunk road which have a speed limit of 80km/hr and encounter speed humps on bridge approach roads whenever there is a long span bridge.

RE: Speed humps

I would have thought 80kph (50mph) is very high to allow speed humps or any vertical traffic calming, usually the upper limit is 30mph (48/50kph).

RE: Speed humps

Are you sure it was a speed hump, or was it simply settlement of the fill behind the abutment? The latter is a common problem. The former is a practice I've never heard of.

     Maybe the tyranny of Murphy is the penalty for hubris.  - http://xkcd.com/319/
 

RE: Speed humps

(OP)
Sorry, the posted speed limit near the approaches is 50km/hr, I was just wondering if it is necessary to calm traffic passing on a bridge which is wide enough for vehicles to pass at 80km/hr. I noticed that the humps are provided when the bridge exceeds 50m span.  

RE: Speed humps

Do you have a GoogleEarth link/location for this bridge?

I've never otherwise seen calming actually on a bridge deck.

RE: Speed humps

Could be incorrect grade/profile on the armor joint(s)

RE: Speed humps

Humps are generally a pretty terrible solution.

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