Rekayasa Lalu Lintas

Table 9 11A. Adjustment factor for right turns ( fRT ); formulas

Cases 1 6; Exclusive/ shared lanes and protected / permitted phasing

fRT = 1.0 - PRT [0.15+(PEDS/2100)(1-PRTA)]

0.0 ( PRT ( 1.0

Proportion of RT in the lane group = 1.00 for excl. RT lane (Cases 1-3);

( 1.00 for shared lane (Cases 4-6).

0.0 ( PRT ( 1.0

Proportion of RT using protected phase = 1.00 for complete protection no-peds;

( 1.00 for permitted with conflicting peds;

0 ( PRT ( 1700

Volume (peds/hr) of peds conflicting with RT (if PEDS) ( 1700, use 1700).

fRT ( 0.05

Case 7; Single-lane approach ( all traffic on approach in a single lane, as defined in Figure 9 3 )

fRT = 0.90 - PRT [0.135+(peds/2100)]

0 ( PRT ( 1.0

Proportion of RT in the lane group.

0 ( PEDS ( 1700

Volume (peds/hr) of peds conflicting with RT (use 0 if RT is completely protected).

fRT = 1.00 if PRT = 0.0

fRT ( 0.05

Range of variable values

Case

PRT

PRTA

PEDS

Simplified formula

1. Excl. RT lane; prot. RT phase

1.0

1.0

0 0.85

2. Excl. RT lane; perm. RT phase

1.0

1.0

0 1700 0.85 (PEDS/2100)

3. Excl. RT lane; prot + perm. RT phase

1.0

0 1.0

0 1700 0.85 (PEDS/2100)(1-PRTA)

4. Shared RT lane; prot. RT phase

0 1.0

1.0

0 1.0 PRT [ 0.15 ]

5. Shared RT lane; perm. RT phase

0 1.0

0.0

0 1700 1.0PRT[0.15+(PEDS/2100)]

6. Shared RT lane; prot + perm. RT phase0 1.0

0 1.0

0 1700 1.0PRT[0.15+(PEDS/2100) (1-PRTA)]

7. Single-lane approach

0 1.0

-

0 1700 0.9PRT[0.135+(PEDS/2100)]

Source ; TRB, 1944.