Calculate harmonic mean for velocity (kmph) data of vehicles moving on an expressway
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- What is the brake reaction distance (ft) when the design speed is 55 mph, assuming the AASHTO recommended deceleration rate and perception-reaction time. Response Feedback: brake reaction distance = 1.47Vtr2. Figure shows the captured aerial photography showing the locations and speeds of 4 vehicles travelling between section x & y. An observer located at X observes the four(4) vehicles passing pt X during a period of 15 sec. Calculate the following: a) Space Mean Speed b) Time Mean Speed c) Average Spacing d) Headway 60 kph 40 kph 45 kph 55 kph Direction D B A of flow 300mP Flag question The following field data were collected on a two-way road using the moving vehicle method. The vph. (MN = 120, Ms = 110, ON = 7, PN= 8, TN = 0.042 hr., Ts = traffic volume northbound (qn) is 0.048 hr.). а. none b. 1211 C. 1312 d. 910 е. 1566
- Consider the following data: · Average number of vehicles (overtaking - overtaken) = 1 • Average number of vehicles during trips in opposite direction of traffic flow = 336 · Average journey time when test vehicle is travelling with the stream = 8 min 31 sec. · Average journey time when test vehicle is travelling against the stream = 7 min 24 sec. Average journey time for the above data is min. %3DDetermine the density (in veh/mi) of a traffic stream comprised mainly of passenger cars, for which a 6-ft long detector measured an occupancy of 17%. Assume an average vehicle length of 18 ft. A. 37.4 B 41.3 C 49.9 D Insufficient information is provided. E None of the aboveplz, solve this problem, it is not graded question. Transportation Engineering-1 During a 70 sec period, a detector is occupied by vehicles for the following times: 0.31, 0.39, 0.41, 0.35, and 0.53 sec. Estimate the values of flow (q), density (k) and speed (v). Assume that the loop detector is 10 ft and that that the average length of the vehicle is 20 ft.
- Problem 2: The following data are taken from 5 vehicles observed from photographs taken 3 seconds apart. Compute the space mean speed, in kph. Vehicles Distance( m) 1 38.4 2. 35.4 3 32.8 4 36.6 37.51. The speed of the traffic flowing past a certain downtown exit between the hours of 1:00 P.M. and 6:00 P.M. is approximately V= t³ - 10.5t² + 30t + 20 miles per hour where t = number of hours past noon. Use the Bisection method in finding the fastest speed of the traffic between 1:00 P.M. and 6:00 P.M. in mph? Find the absolute relative approximate error up to 0.10%.Estimate the maximum number of cars in a single lane of traffic that would pass a check-point in one hour at an average speed of 50 mph. Safe driving practice requires one car length of spacing for each 10 mph speed. (a) Layout the procedure for making the estimation including assumptions, diagrams, equations, etc.
- COMPUTE THE MINUMUM PASSING SIGHT DISTANCE FOR THE FOLLOWING DATA: SPEED OF THE PASSING CAR = 90 KPH SPEED OF THE OVERTAKEN VEHICLE = 80 KPH TIME OF INITIAL MANEUVER = 4 SEC AVERAGE ACCELERATION = 2.4 KPH/SEC TIME PASSING VEHICLE OCCUPIES THE LEFT LANE = 9 SEC DISTANCE BETWEEN THE PASSING VEHICLE AT THE END OF ITS MENEUVER AND THE OPPOSING VEHICLE = 80 KPHfrom the following data of a freeway surveillance, there are 5 vehicles traveling distances "S" when observed on the two photographs taken every 2 seconds apart. Vehicles “S" (meters) 1 24.4 2 18.8 3 24.7 4 26.9 5 22.6 Determine the flow of traffic. Group of answer choices 8000 yph. 8500 yph 9000 yph 9500 yph.From the following data of a freeway surveillance, there are 7 vehicles under observation and the following distances are the distance each vehicle had traveled when observed every 2 sec. Compute the space mean speed in kph. Note: use two decimal places Distance Vehicles (m) 24 24 20 21 23 3. 4-