Why have parapets?
Parapets are provided to prevent users form falling from the bridge.
If you provide them it indicates you recognise the hazard.
The question then arises if one parapet is sufficient?
In some locations there would be no injury and in others the fall could be fatal
The User Type is an issue. Small active children can get through or climb on a parapet leading to a possible incident.
In some locations when danger is high a 100mm sphere should not pass through any opening.
The parapet height is intended to prevent a person falling over the top of it.
Horse riders and cyclists require higher parapets
Fences are now provided in hazardous places other than bridges
