Traffic Engineering(Departmental Elective - II) — Winter 2018

Define : operating speed, design speed, space mean speed.

How do different vehicular characteristics affects road features ?

Atest car was used on a north-south road 0.75 km long, and the following data, for the moving car was collected. North trip Travel No. of No of No of no. time(along) vehicles met vehicles vehicles in min against overtaking overtaken test car by test car 1 2.65 85 1 0 2 2.70 83 3 3 2.35 77 0 4 3.00 85 2 0 5 2.42 90 1 1 South trip Travel No. of No of No of no. time(along) vehicles met vehicles vehicles in min against overtaking overtaken test car by test car 1 2.33 110 2 0 2 2.71 115 0 3 2.48 120 0 0 4 2.54 125 1 1 5 2.16 105 0 Calculate traffic volume, average travel time and space mean speeds in both directions.

Explain (any three) physical factors of road user.

Explain about classified traffic volume count survey with observation table.

Avehicle is accelerating on an upward gradient of 1.5 % with a rate of 0.8m/sec2, from initial speed of 15 to 25 km/h. Calculate various resistances encountered by the vehicle using following data : 1. Mass of vehicle : 1500 kg. 2. Coefficient for rolling resistance : 0.02 3. Frontal area of vehicle : 3.5 m2 4. Coefficient for air resistance : 0.40 kg/m3

Adriver travelling at 50 km/hr behind another vehicle decides to overtake it and presses the accelerator. The accelerating behavior of the car is described by the following equation. dV = 1.22 - 0.015 V dt Where, Vis speed in m/sec and t is time in sec1 Determine:- (1) The maximum speed of vehicle. (2) The maximum rate of acceleration. (3) The rate at which the vehicle is accelerating after 3 seconds given by dV e-βt = (α – βV )0 dt

Define with respect to traffic signal : phase, lost time, red interval

Explain trial cycle method of signal design.

What are the advantages and disadvantages of providing traffic signals?

Define with respect to traffic signal : cycle, cycle length, interval,

Explain Webster’s method of signal design.

Draw at least 5 signs of each (not to scale) Regulatory signs, Warning signs and Informatory signs.

Explain enoscope method of spot speed study.

Find Time mean speed and space mean speed from following data. Speed range(kmph) Frequency 0-10 10-20 18 20-30 26 30-40 30 40-50 18

What is the importance of highway lighting ? State the factors influencing night visibility.

Enumerate with an example about intersection delay count survey.

Calculate Time mean speed and Space mean speed from the following spot speed observations in km/hr. 50,40,60,54,45,31,72,58,43,52,46,56,43,65,33

Draw layout of lighting on

Single side of road (ii) Both side of road(staggered) (iii) Central (iv) At Tintersection

Define: Luminous flux, foot candle, Luminaire

State advantages and disadvantages of over-pass or flyover.

Draw a neat sketch of rotary intersection, show all design components and explain about them in brief.

Indicate and explain how spacing of street lighting is decided.

Prepare a check list of facilities to be provided at any terminal. Justify your answer for each of facility to be provided.

Draw a neat sketch of

Partial clover leaf intersection (ii) Full clover leaf intersection. (iii) Diamond interchange.