5. If 80% of the applicants rae able to pss a driver's proficiency road test, find the mean, variance and standard deviation of the number of people who pass the test in a sample of 300 applicants.
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- At an impaired driver checkpoint, the time required to conduct the impairment test varies (exponentially distributed) 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.An engineer, wishing to determine the travel time and average speed along a section of an urban highway as part of an annual trend analysis on traffic operations, conducted a travel time study using the floating-car technique. He carried out 10 runs and obtained a standard deviation of ±3.4 mi/hin the speeds obtained. If a 5 percent significance level is assumed, is the number of test runs adequate?Speed data collected on an urban roadway yielded a standard deviation in speeds of 4.8 mi/h. (a) If an engineer wishes to estimate the average speed on the roadway at a 95% confidence level so that the estimate is within 2 mi/h of the true average, how many spot speeds should be collected? (b) If the estimate of the average must be within 1 mi/h, what should the sample size be?
- To study congestion in the core of a city, a survey measured traffic volume at a busy intersection between the hours of 1300 and 1600. Describe the bias that could influence the results of this survey. Suggest ways in which the survey could be redesigned to reduce the possibility of bias.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.The accompanying data show spot speeds collected at a section of highway located in a residential area. Using the student's t test, determine whether there was a statistically significant difference in the average speeds at the 95% confidence level.
- Data on a traffic accident recorded on a certain intersection for the past 5 years has an accident rate of 416 per million entering vehicles. If the average daily traffic entering the intersection is 504 find the total number accidents during the 5 year period.The number of accidents for 6 years recorded in a certain section of a highway is 589. If the average daily traffic is 476, determine the accident rate per million entering vehicles.Data on a traffic accident recorded on a certain intersection for the past 7 years has an accident rate of 4288 per million entering vehicles (ARMV). If the average daily traffic entering the intersection is 492, find the total number of accidents during the 7-year period
- A 15 mile section of Kapayapaan Road had the following reported accidents for 6 years from 1992. It is required to compute the accident rates of all accidentsplz, solve this question, it is not graded question. Transportation Engineering-1 Space Requirements for a Parking Garage The owner of a parking garage located in a CBD has observed that 22 percent of those wishing to park are turned back every day during the open hours 8 a.m. to 6 p.m. because of a lack of parking spaces. An analysis of data collected at the garage indicates that 65 percent of those who park are commuters, with an average parking duration of 9 hours, and the remaining percentage are shoppers, whose average parking duration is 2 hours. If 25 percent of those who cannot park are commuters and the rest are shoppers, and a total of 220 vehicles currently park daily in the garage (i.e. parking spaces are 220), determine the number of additional spaces required to meet the excess demand. Assume parking efficiency is 0.90.The posted speed along Daang Maharlika Highway is 60 km/hr. The Table below shows the summary of 150 samples of spot speeds along Sumulong Highway. a. Compute for the Mean b. Compute for the Median c. Compute for Modal d. Compute for the 85th percentile (Using interpolation method) e. What is the speed limit for Daang Maharlika Highway?