TRANSPORTATION EXAM II

The duration of the spot speed study should be such that the minimum number of vehicle speeds required for statistical analysis is recorded. Typically, the duration is at least 1 hour and the sample size is at least ___________ vehicles. 30 Since 50% of the speed values will be greater than the median speed and 50% will be less than the median, the median speed should be equal to the average speed. False The normal distribution curve is called the "bell curve". The area under the curve between u+2o is 0.95 For traffic, AADT usually equals to ADT because AADT and ADT are the same thing. False Short term traffic count, usually 15 minutes, are used to generate statewide traffic data such as the WisDOT Traffic Count Map False Traffic camera at intersections not only provide important traffic data for engineers but also critical data for police officers to conduct traffic accident investigation as shown in the following picture True There are many methods/equipment for conducting spot speed and volume studies. Which method is not discussed in the textbook? weigh-in-motion sensors While you were waiting for the bus this morning at 8am, you counted 10 vehicles passing by in 2 minutes time. What was the estimated flow of the road at 8am? 300 veh/hr The unit of traffic density is ________ veh/mi The fundamental diagram of traffic flow indicates that as the density increases, the flow always increases. false The speed limit posted on highways is the optimal speed that maximizes the flow of the highway. false Traffic data were collected to study the capacity of a highway section, but the axis titles are missing. If the y-axis would most likely be Speed, what would the x-axis be? Density Which statement is correct regarding to the Greenshilds Model and Greenberg Model? Greenshields model can be used for both light and dense traffic The major limitation of modeling traffic as fluid flow is that ____ Unlike fluids which are continuous, traffic streams are made up of discrete elements wh