Roundabouts may have a raised "central" core, similar to a breakdown lane ( but not for that purpose) that a vehicle can pass over but the main travel lane is flat / paved. Concerns with snow plowing, etc are potentials hazards with raised pavers. Individuals not familar with roundabouts may be confused or unsure. Speed is an issue as well as the "right of way". A very good example is the roundabout at the junction of rt 9 / 5 / IS 91 in Brattelboro , Vt just over the NH border. The idea is fine but the design flawed (even governments make errors)
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