Table 7: Summary of time headway, follow-up time and critical gap computations at x = 0.50.

Site Model Equations
X = 0.50
Dry
Traffic Flowrate
Rainfall
Traffic Flowrate
Follow-up Time tf (s)±10% Gap Time tc (s) ±10%
Qe
pcu/h
Qc
pcu/h
Qe
pcu/h
Qc
pcu/h
Dry
tf (s)
Rainfall
tf (s)
Dry
tc (s)
Rainfall
tc (s)
01
k=0.95
QE = 2280-1.17Qc-146RL 542 463 507 434 6.65 7.11 7.33 7.70
QE = 2211-1.09Qc-302RM 525 482 453 409 6.86 7.95 7.02 8.21
QE = 2159-1.04Qc-345RH 513 493 431 415 7.02 8.36 6.85 8.09
02
k=0.98
QE = 1967-1.23Qc-71RL 482 392 465 378 7.47 7.75 8.73 8.92
QE = 1908-1.17Qc-191RM 468 400 421 360 7.70 8.56 8.56 9.41
QE = 1805-1.06Qc-264RH 443 418 378 361 8.14 9.54 8.17 9.39
03
k=0.93
QE = 1985-0.99Qc-110RL 462 467 436 441 7.80 8.26 7.27 7.57
QE = 2038-1.04Qc-270RM 474 479 411 416 7.59 8.76 7.07 8.06
QE = 1900-0.92Qc-379RH 442 481 354 381 8.14 10.18 7.04 8.86
04
k=0.97
QE = 1902-1.19Qc-61RL 461 416 446 387 7.81 8.07 8.20 8.71
QE = 1716-0.88Qc-149RM 416 490 380 447 8.65 9.47 6.90 7.45
QE = 1556-0.61Qc-183RH 378 640 333 565 9.54 10.83 5.18 5.77

Note: RL, RM, RH - light, moderate and heavy rainfall respectively; k-correction factor for entry radius and angles; tf denotes follow-up time; tc denotes critical gap, and x denotes degree of saturation; Qe denotes entry capacity; Qc denotes circulating capacity