Roadway Design Question and Answer Forum
Criteria
Question:
What is the proper way to put monolithic conc islands on a two
lane road that widens out for left turn lane in terms of xsc?
Answer:
Since then, beginning with the 2002 to the current 2006 Drawing Standards, the nominal gutter back slope is
currently 0.25'/1' (or 4:1) and the gutter back depth is set to 12".
Here are the three cross sections played through the
Cross Section Movie Navigator.
REFERENCE:
Roadway Standard Drawings, 2006, STD. 852.01 Concrete Islands
