Design Values Perception/Reaction Time = 2 seconds Average Vehicle Length = 25 ft Lane Width = 12 ft Deceleration Rate = 12 ft/sec² Design Speed = 25 mph Start/End Lost Time per phase = 2 sec Saturation Flow Rate = 1900 vphgpl Pedestrian Walk Speed = 3.5 ft/s Minimum Walk Interval = 7 sec Pedestrian perception reaction for walk signal = 3.2 sec 1. The flow rate on a given freeway segment is 1250 vph and the space-mean-speed is 40 mph. Determine: a. the average headway under these conditions b. the average spacing under these conditions c. the equations for the three relationships (q-k, k-u, and q-u) assuming that the flow-density- speed relationship of this freeway segment is described by the Greenshield's model and the free flow speed is 50 mph.

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Unit Conversion

Standard units are also called SI units. SI units are used for measuring a physical quantity satisfying certain conditions. There are two types of units: fundamental units and derived units. Fundamental units are physical quantities that are independent, that is, they do not depend on other quantities like mass, length, or time. There are plenty of quantities in our lives which need to be measured and compared. Measuring is the comparison of a particular physical quantity with its reference value. A unit is a measure of a fixed physical quantity. A physical quantity is the product of a unit and the numerical value we need to compare with.