Question

What is the difference between actual green time and effective green time A They are the same, just different naming terminologies B Actual green time include lost times while effective green time esclude lost times C. Actual green time include pedestrian time while effective green does not D. One is calculated using Highway Capacity while the other in Wester Method Ideal (base) sauration flow rate is taken as So - 1.900 pphalThis value (1900) onte as dividing 3600 by Aspeed B: density C:headway Despacing Semiautotrolisa signal control in which both approaches have traffic detector TRUE FALSE Dilemmae theory is used to determine which basic infectional pa r t 2 Asmod time B: Yellowtime C Green Time D. Cycle length The difference between a V and crest vertical curve is that A with a vertical curves the positive effect of gravity is while with storical curves the negative effect of gravity is used e rtical curves 45 is as the driver's ch i lei doces vertical curve C with cest vertical curve drivere height dat het d ie vertical curve iv. B D igg die is die verticale with rest vertical curve When maying vertical curves for distance, a primary that the checked is 2 A whether the pag distance is the rear than the distance whether the length of curveis shorter or longer than the distance C whether the driver ye height is less or more than the midordinate distance whether the Kve is less of more than the design speed vil. Theregth of a crear are can be defined as 2pts A its center point and radius B. the distance from its point of curvature to its point of sangency C adius and degree of curve Dichand and point of intersection la pavement design, what does ESAL stand for? 2pts A equivalent single w load Boquivalent semi axle load C equivalent single and load Dequivalent separate and load in Truck traffic loads are quantified in terms of the following except 2pts A length of the truck B Number of axles C onfiguration of les D. their load mpitude ESAL is number of repetitions of n 18.000 pounds axle load applied to a pavement. TRUE FALSE xi. Given intersection traffic volumes, geometry and phasing The following information applies Last time per phase 3.5 sec, Saturation headway is 18 sec/veh per Lane for all movement Pedestrian demand for all approaches is 100 per hour Determine; a) Desired Cycle length using Budget Method (approx to nearest tens) b) Cycle length using Webster Method (po to nearest Ins) c) Cycle length using Highway Capacity method (approx to nearest five) d) Effective Groen time for each phase using Cycle length determined in (a) above e) Find the minimum green for N-S considering pedestrians (use cycle length in (a)) ing (3 (3 A proposed Mighway has two news with centrale of 55" The desig n to obtain the best for the simple curve t h e decides that the ( Mis to be 112.99 The Mission 65.2057. Dettemmin (a) The radius of the curve b) Thelpth of the tapet (c) The state of the NC (d) The long of the curve The ofthe PT (1) Degree of the curve The length of External Ordinate Acres vertical curve connects a g rade and -25% de. The station 10.000 wo of 100.00. The design speed is 70 mith. If the length is 1084 determine: ch) The water the BVC c) The devin of the BVC (d) The station of the EVC (e) The dewithe EVC The station of the highest point on the curve (g) The clevation of the highest point on the curve 13

Answer 1

(i) What is the difference between actual green time and effective green time.

Effective green time = Actual green time + amber time - total lost time

• From the above formula, we understand that actual and effective green times are different terms, making option A wrong statement.
• Total lost time include all red time or pedestrian crossing time. So actual green time include pedestrian time. But the statement C is not always true, because in intersections where pedestrian crossing are negligible, this pedestrian crossing time is omitted. Thus it is not the right answer denoting the difference between actual and effective green time.
• Both HCM method and Webster method can be used to calculate effective green time. Thus option D is wrong

Thus the correct statement is, "actual green time include total lost time but effective green time exclude total lost time". Thus option (B) is correct.

References

1. Highway capacity manual

2. "Highway Engineering, tenth edition" , by S K Khanna, C E G Justo and A Veeraragavan.

Answer(i) : Option B