120507 RBT guide - jste.or.jp

1 ( ) (Draft) guide for Roundabout Planning and Design Ver. 2009 ( ) Japan Society of Traffic Engineers 1 18 19 2 ( )

2 ( ) ( ) 2 ( ) 18 19 20 3 ( ) ( ) ( ) ( )

3 3 1.. 4 .. 4 .. 5 .. 7 .. 7 .. 9 .. 9 .. 10 2.. 12 .. 12 .. 15 3.. 20 .. 20 .. 20 .. 21 .. 21 .. 21 .. 22 .. 23 .. 24 .. 24 .. 26 4.. 27 .. 27 .. 27 .. 28 .. 30 .. 33 .. 36 4 1.

4 (roundabout; ) 18 19 2 ( 3 2007 ) 2007(2007 )

5 1 ( )

6 5 2 3 4 (roundabout)

7 ( ) * * * * 2 1 2 3 4 ( )

8 * * * * 2 1 2 3 4 6 (a) (b) (c) 1 (a) (b) (c) ( ) (a) ( ) (b) ( ) (c) ( )

9 ( 7 (Department of Transport(1993): Geometric Design of Roundabouts, TD 16/93 ) (FHWA(2000): Roundabouts, an Informational guide ) (1) (diameter) ( ) (2) (central island) ( ) (3) (circular roadway) ( ) (4) (apron) (5) (splitter island) (6))

10 (entry/exit) 3 (1) (compact roundabout) 1 26 40m 8 ( ) (2) (mini roundabout)