Editing Single-point urban interchange (section)

===Three-level SPUI===
A three-level SPUI is similar to a standard SPUI but includes an additional grade separation allowing for free-flowing through traffic on the crossroad;<ref>{{Cite book |url=https://books.google.com/books?id=Lcw1AQAAMAAJ&pg=SA11 |title=Interstate 64/Route 40 Corridor, City of St. Louis and St. Louis County: Environmental Impact Statement |date=2005 |language=en}}</ref><ref>{{Cite journal |date=2014 |title=Pharmacy regulator sets up FTP advisory group |url=http://dx.doi.org/10.1211/pj.2014.20066574 |journal=The Pharmaceutical Journal |doi=10.1211/pj.2014.20066574 |issn=2053-6186|url-access=subscription }}</ref> such through traffic thus bypasses the signalized intersection. The remaining intersection, free of the crossroad's through traffic, uses a [[traffic light#Rules|two-phase traffic signal]] for handling the left turns in pairs, similar to the traffic flow at an inverted SPUI.

Examples include:
* [[Skudai Highway|Jalan Tun Abdul Razak]] (Federal Route&nbsp;1) in [[Johor Bahru]], [[Johor, Malaysia|Johor]], [[Malaysia]], at [[Johor Bahru Inner Ring Road|Jalan Lingkaran Daram]] (Federal Route&nbsp;188). Jalan Lingkaran Daram passes over the SPUI. ({{coord|1.472685|N|103.755698|E|}}).
* [[Central Expressway, Singapore|Central Expressway]] (CTE) in [[Singapore]], at [[Outer Ring Road System|Braddell Underpass]]. Braddell Road passes under the SPUI. ({{coord|1.3434|N|103.8604|E|}});
* Jinxing Avenue ([[Chinese language|Chinese]]: 金星大道 [[Pinyin]]: Jīnxīng dàdào) in [[Yubei District]], [[Chongqing]], [[China]], at Food City Avenue (Chinese: 食品城大道 Pinyin: Shípǐn chéng dàdào). This is a partial three-level SPUI in which one of the ramps from Food City Avenue to Jinxing Avenue passes under the SPUI. ({{coord|29.660116|N|106.612711|E|}}).