tte4004%20Chapter%202%2C9 - Capacity of freeway sections:...

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Capacity of freeway sections: pp.359-375 Understand capacity and level of service are the heart of transportation analyses Understand capacity analysis was set up for ideal cases and modifications are made to reflect prevailing conditions Understand many factors (geometric, traffic, and control characteristics) affect the capacity and level of service of a facility
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What will we cover today… Definition of capacity and level of service Definition of basic freeway segments Factors affecting capacity and LOS of basic freeway segments Relationship between speed, flow rate, density, and level of service Operational analysis and planning analysis for basic freeway segments
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Issues of traffic capacity analysis Two issues of traffic capacity analyses ¾ How much traffic a given facility can accommodate (capacity analysis)? ¾ Under what operating conditions can it accommodate that much traffic (level of service)? Highway Capacity Manual (HCM) ± 1950 HCM by the Bureau of Public Roads ± 1965 HCM by the TRB ± 1985 HCM by the TRB (Highway Capacity Software developed) ± 1994 updates to 1985 HCM ± 1997 updates to 1994 HCM ± 2000 HCM 2000 was published
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Capacity concept Capacity as defined by HCM: the maximum hourly rate at which persons or vehicles can be reasonably expected to traverse a point or uniform segment of a lane or roadway during a given time period under prevailing conditions .” ± Traffic ± Roadway ± Control With different prevailing conditions, different methods to estimate capacity HCM analyses are usually for the peak (worst) 15- min period. Some regularity expected (but capacity is not a fixed value) Sometimes using persons makes more sense, like transit
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Level of service “A level of service is a letter designation that describes a range of operating conditions on a particular type of facility.” LOS A (best) LOS F (worst or system breakdown) LOS is defined by a single measure of effectiveness (MOE).
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tte4004%20Chapter%202%2C9 - Capacity of freeway sections:...

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