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According to Keil (2013), the primary design function of a pedestrian bridge is to transport people from point A to point B as safely and efficiently as possible.

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According to Keil (2013)The necessity of moving people particularly with shortest path this reason  behind design pedestrians bridge.

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Keil reported that designer create the bridge to shorten distance for pedestrain

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According to Kiel, A. (2013), the main function of the bridge is to make the route shorter and safer for road users 

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According to Kiel, A. (2013), the main function of the bridge is to make the route shorter and safer for road users 

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The function of a pedestrian bridge is to moving people Over a river in a short path.

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The essential function of pedestrian bridge is using the limited distance to move people (Keli, 2013).

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A further problem is the pollution caused by the exhaust fumes of the combustion process
(Kegl, 2013).

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The third problem is caused by the chemical reaction of changing the fuel inside the engine into mechanical energy.This process release by-product as a burning fume into the environment from exhaust.

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The exhaust emissions of the chemical processes of changing fuel energy into movement energy are third problem

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Karlid in order to produce energy in diesel motor there chemical and mechanical reactions happened and as a result of this operation harmful production released

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The by products which release into the environment is considered the third problem of the chemical process of transportation of internal fuel energy into mechanical work.

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The third problem is releasing the byproducts of this process which come from diesel machine 

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The third problem is releasing the byproducts of this process which come from diesel machine 

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The third problem have a relationship with release pollution due to chemical process of burning diesel petrol.