Assertion: fence's impact | /r/RelatedTo | the environment
Facets:
Source sentences:
text: The material of rails used to stop the flow of objects into the protected area must be durable and strong enough to withstand any impacts related to the environment in which it is installed; for example, a guard rail on the side of the road must be able to contain and safely stop or drastically slow down a vehicle weighing up to 40 tons (cable barriers are most effective against tractor trailers), whereas a pedestrian safety barrier only needs to be tall enough, designed with a lattice effect to keep people from climbing through it, or highly visible when being used to display caution.