Manhole covers are typically located in the middle of the road for several reasons:

1. Accessibility: Manholes provide access to underground utilities such as sewage systems, water pipes, or electrical conduits. Placing them in the middle of the road often allows for more direct and straightforward routing of these systems.

2. Safety: If manholes were located on sidewalks, they might pose a risk to pedestrians, especially those with visual impairments. In contrast, road vehicles are better equipped to safely pass over manholes.

3. Infrastructure layout: The underlying infrastructure that manholes access, such as sewer lines and water mains, often runs beneath the roadways, following the same general path. Therefore, placing manholes in the road provides the most direct access.

4. Construction and maintenance: When maintenance or construction work needs to be performed, it's often safer and less disruptive to divert or control road traffic than to block pedestrian walkways.

Despite these reasons, you might still find some manholes on sidewalks or other areas depending on the specific layout and needs of the underground infrastructure. The placement is ultimately determined by utility companies and city planners based on what is most practical and safe.
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