Why are manholes typically on the road and why are there sometimes 2 or 3 very close together?
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In urban areas much of the needed infrastructure for daily living (water supply, sewage, drainage, electrical connection, telephone wiring, cable wiring, etc) may be built under ground. Access points are placed strategically throughout each system to provide public works ways of accessing these underground systems for repairs or maintenance without having to dig them up necessarily. And since roads are generally on publicly owned land, many of these access points are manholes built into roads and covered with steel disks that are heavy and sturdy enough to bear the weight of the vehicles driving over them. In areas where topography, and population density make useful public real estate scarce, you might find several access points for several different systems in the same general area.
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