282 CHAPTER ELEVEN
Figure 11.8 shows the use of curves in at-grade four-leg intersections of
highways. Figure 11.9 shows the use of curves in at-grade T (three-leg)
intersections. Figure 11.10 shows street space and maneuvering space used
for various parking positions.
Grade
separation(a) (b)(c) (d)(e) (f)(g)(h)FIGURE 11.7 Types of interchanges for intersecting grade-separated highways: (a) T or
trumpet; (b) Y or delta; (c) one quadrant; (d) diamond; (e) full cloverleaf; (f) partial clover-
leaf; (g) semidirect; (h) all-directional four leg.