Roundabout Design in Civil 3D #5: Inscribed Diameter and Central Island

Описание: This video briefly explains inscribed diameter and the central island in roundabout design. It defines inscribed diameter as the distance across the outer curb of the circulatory roadway and provides recommended ranges. For the central island, it covers its definition as the raised center area, the preference for a circular shape, and alternative shapes for specific situations. It also touches on adjusting these parameters in Civil 3D.

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00:00 Intro
00:26 Inscribed Diameter Defined: What inscribed diameter means.
01:19 Mini Roundabout Diameter: Recommended size for mini roundabouts.
01:50 Vehicle Impact on Diameter: How design vehicles affect inscribed diameter.
02:24 Multi-Lane Diameter: Sizes for roundabouts with multiple lanes.
03:37 Larger Roundabouts: When bigger diameters are needed.
04:42 Central Island Defined: What the central island is.
05:35 Circular Island Benefit: Why circular islands are preferred.
06:15 Oval Island Use: When oval shapes are necessary.
06:41 Raindrop Island: Special Island shape for interchanges.
07:58 Civil 3D Adjustments: How to modify these parameters in software.