An observation on an Expressway yielded a count of 200 vehicles in a period of half an hour. Calculate the number of headways in this count: (i) greater than 4.5 seconds and (ii) less than 18 seconds
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- Six vehicles are observed in a 200 m section of a highway. If the average time headway is 4 sec., determine the density of flow (veh/km), flow of traffic (veh/hr) and space mean speed (kph).An observer counts 240 veh/h at a specific highway location. Assume that the vehicle arrival at the location is Poisson distributed, the probability of having one vehicle arriving over a 30 seconds time interval isthe following travel times were observed for four vehicles traversing a one km segment of highway. Observation time are 1.6min,1.2min, 1.5 min, and 1.7 min for vehicles A, B, C, and D respectively. find the rate of flow if the density is 20 veh/km
- An observer counts 240 veh/h at a specific highway location. Assume that the vehicle arrival at the location is Poisson distributed, the probability of having one vehicle arriving over a 30- second time interval isThe following data were taken on five vehicles travelling consecutively 1.5 km portion of the NLEX. Vehicle Time (minute) 1 1.2 1.0 3 1.4 4 1.3 1.1 Determine the time mean speed (kph) 76.07 75.00 O 76.00 O 75.07 2.A flow characteristic that is related to the density and obtained from speed data is occupancy. Data obtained from a 6-ft by 6-ft inductive loop detector is used to determine the traffic density. With an occupancy of 9.375%, determine the density, in vehicles per mile, for a mean vehicle length of 27 feet.
- There are 11 vehicles observed in a 500 m section of a highway. The average time headway is 3 seconds. What is the value of the space mean speed in kph?the following data were taken on five vehicles travelling consecutively 1.5km portion of the NLEX. Vehicle Time(minute) 1 1.2 2 1.0 3 1.4 4 1.3 5 1.1 Determine the density of traffic in (Veh per km) 3.33 3.83 4.33 2.83F] Vehicles travel at constant speeds on a one-lane one-way street between sections X and Y. An observer located at point X observes the four vehicles passing point X during a period of 10 seconds. The speeds of the vehicles are measured as 45, 45, 40, and 30mph, respectively. Calculate the average flow, density, time mean speed, and space mean speed.
- Traffic on a three-lane (in each direction) freeway observes the following Greenshields flow relationship: V = 60D(1-D/360) where V is the traffic volume on vehicle per hour, and D is the traffic density in vehicles per mile. At 10:00 am, an accident occurs at point A (in the following Figure). The vehicles involved immediately pull off onto the shoulder of the roadway, but traffic passing the incident slows to 10 mph as drivers survey the damage on the side of the road (sometimes called "spectator slowing"). Lucy enters the freeway via the ramp at point B, also at 10:00 am. Upon entering the freeway, she notes that traffic on the freeway is moving along at about 40 mph. Scene at 10:00 am B Lucy 4 Miles A. How fast (i.e., at what speed) will back up from the "spectator slowing" progress upstream of the accident site? number only in units of miles per hour and rounded to the nearest whole number, i.e. XX.) B. When (i.e., at what time) will Lucy first hit slowing traffic due to the…At an impaired driver checkpoint, the time required to conduct the impairment test varies (according to an exponential distribution) depending on the compliance of the driver, but takes 60 seconds on average. If an average of 30 vehicles per hour arrive (according to a Poisson distribution) at the checkpoint, determine the average time spent in the system in minutes/vehicle. Answer in whole number.An investigation was conducted to determine the delay at Sohar downtown intersection. The traffic signal at the intersection operates with a cycle time of two minutes. The test was conducted on the 2 lane road over a 15- minutes period. The count interval was 20 seconds and the empirical adjustment factor 0.8. The total number of vehicles is 610, total number of vehicles in queue is 382, and the total number of stopped vehicle is 276. Assume the traffic density is 85 vehicles/km and the flow is 2650 vehicles/hr. Evaluate the following: i. each cycle Number of vehicles stopped per lane ii. Acceleration/Deceleration correction delay ii. Fraction of vehicles stopping iv. Control delay for each vehicle