City explains why utility access points on roads sometimes positioned right in the path of oncoming traffic
Drive down any city street and you might notice there seems to be no rhyme or reason where road designers have positioned manhole covers.Otherwise known as maintenance hole covers, the round cast-iron covers you see on the street are access points to an underground shaft or utility vault and their heavy weight prevents unauthorized access and keeps material from falling down to the utilities built below street level.
So why are some of the covers positioned on the part of a traffic lane where most vehicles hit them as they drive by?“When it comes to maintenance holes, the guiding principles are that there must be a 10-foot/three-metre space between the water, storm and sewer holes. The reason for this is if there was an issue with the sewer it needs to be far enough away from the water is to not have any cross-contamination, for example.
When roads are resurfaced and the old asphalt is milled to prepare for new pavement, road crews and engineers try to make the new pavement around the hole close to the road surface and can raise or lower it depending on the height of the metal ring that supports the cover.
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