Page 351 - Civil Engineering Formulas

282 CHAPTER ELEVEN

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.

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.