Talk:Single-point urban interchange
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single point urban interchange
editReference 6 relates to a tight diamond interchange. Better to compare to a diverging diamond interchange that has only two phase signals. This then has 50% more capacity than a single point interchange because of fewer phases, and because of shorter clearance distances that waste time and cause blockages when combined with freeway ramp metering. It also has 50% fewer crashes. It follows that diverging diamond interchanges have more capacity and safety and it is hard to see where a single point interchange would have any advantage. John cleeland (talk) 23:52, 6 July 2022 (UTC)
- A SPUI has only one traffic light with only three total phases necessary. This resulting intersection is therefore as far away as possible from the next adjacent intersections before and after the freeway, whereas diamonds have intersections on the outer edges of the system which are closer to surrounding intersections. This means SPUIs have the advantage of not interfering with the processing of other intersections as quickly as diamonds. —alex98.me Alex Hartzell ~2026-75727-0 (talk) 00:46, 22 February 2026 (UTC)