ML063460315
| ML063460315 | |
| Person / Time | |
|---|---|
| Site: | Indian Point  |
| Issue date: | 12/08/2006 |
| From: | KLD Associates |
| To: | Office of Nuclear Reactor Regulation |
| References | |
| FOIA/PA-2006-0299 | |
| Download: ML063460315 (4) | |
Text
- s APPENDIX A Glossary of Traffic Engineering Terms Kj
APPENDIX A: GLOSSARY OF TRAFFIC ENGINEERING TERMS Term Capacity Centroid Content Destination Entry Node Exit Node Green-Time to Cycle Time Ratio (G/C Ratio)
Internal Node Level of Service Definition Maximum number of vehicles which have a reasonable expectation of passing a given section of roadway in one direction during a given time period under prevailing roadway and traffic conditions.
These are estimates which are expressed as vehicles per hour (vph).
An origin or destination located in the interior of the EPZ.
Number of vehicles occupying a section of roadway at a particular point in time.
A location in the network, either within the interior or on the periphery, of the EPZ to which trips are attracted.
A network node, that serves only as an origin. Vehicles are generated there and move onto the network to travel toward their respective destinations.
A network node, usually located on the periphery of a network, which serves only as a destination. Vehicles that arrive at an exit node are discharged from the network.
The ratio of the duration of a green interval to the signal cycle length.
This ratio is the proportion of time available to service specified traffic movement discharging from specified approaches to an intersection.
All nodes that are not Entry or Exit nodes. Vehicles travel through these nodes from one link to the next along their respective paths toward their respective destinations.
An index (A, B,..., F) which is a qualitative descriptor of the operational performance of traffic on a section of roadway, usually expressed in terms of speed, travel time or density. In practice, each Level of Service index is often associated with a range of service volumes. This relation depends on the type of facility (freeway, rural road, urban street).
Indian Point Energy Center Evacuation Time Estimate A-2 KLD Associates, Inc.
Rev. I
Tern Link Measures of Effectiveness Node Origin Network Definition A network link represents a specific, one-directional section of roadway.
A link has both physical (length, number of lanes, topology, etc.) and operational (turn movement percentages, service rate, free-flow speed) characteristics.
Statistics describing traffic operations on a roadway network.
A network node generally represents an intersection of network links.
A node has control characteristics, i.e., the allocation of service time to each approach link.
A location in the network, either within the interior, or on the periphery, where trips are generated at a specified rate expressed in vehicles per hour (vph). These trips enter the roadway system to travel to their respective destinations.
A graphical representation of the geometric topology of a physical roadway system, which is comprised of directional links and nodes.
Relate to the physical features of the roadway, the nature (e.g., composition) of traffic on the roadway and the ambient conditions (weather, visibility, pavement conditions, etc.).
Maximum rate at which vehicles, executing a specific turn maneuver, can be discharged from a section of roadway at the prevailing conditions, expressed in vehicles per second (vps) or vehicles per hour (vph).
Maximum number of vehicles which can pass over a section of roadway in one direction during a specified time period with operating conditions at a specified Level of Service. (The Service Volume at Level of Service, E, approximates Capacity.)
Service Volume is usually expressed as vehicles per hour (vph).
The total elapsed time to display all signal indications, in sequence. The cycle length is expressed in seconds.
A single combination of signal indications. The interval duration is expressed in seconds. In general, a sequence of intervals comprise a signal phase.
Prevailing roadway and traffic conditions Service Rate Service Volume Signal Cycle, Cycle Time, Length Signal Interval Indian Point Energy Center Evacuation Time Estimate A-3 KLD Associates, Inc.
Rev. 1
Term Definition Signal Phase Traffic Assignment Traffic Density Traffic Distribution Traffic Simulation Traffic Volume Travel Mode Trip Table or Origin-Destination Matrix Turning Capacity A set of signal indications (and intervals) which services a particular combination of traffic movements on selected approaches to the intersection. The phase duration is expressed in seconds.
A process of assigning traffic to paths of travel in such a way as to satisfy all trip objectives (i.e., the desire of 'each vehicle to travel from a specified origin in the network to a specified destination) and to optimize some stated objective or combination of objectives. In general, the objective is stated in terms of minimizing a generalized "cost". For example, "cost" may be expressed in terms of travel time.
The number of vehicles that occupy one lane of a roadway section of specified length at a point of time, expressed as vehicles per mile (vpm).
A process for determining the destination of all traffic generated at the origins. The result often takes the form of a Trip Table, which is a matrix of origin-destination traffic volumes.
A computer model designed to replicate the real-world operation of vehicles on a roadway network, so as to provide statistics describing traffic performance.
These statistics are called Measures of Effectiveness.
The number of vehicles that pass over a section of roadway in one direction, expressed in vehicles per hour (vph). Where applicable, traffic volume may be stratified by turn movement.
Distinguishes between private auto, bus, rail and air travel modes.
A rectangular matrix or table, whose entries contain the number of trips generated at each specified origin, during a specified time period, that are attracted to (and travel toward) each of its specified destinations. These values are expressed in vehicles per hour (vph) or in vehicles.
The capacity associated with that component of the traffic stream which executes a specified turn maneuver from an approach at an intersection.
Indian Point Energy Center Evacuation Time Estimate A-4 KLD Associates, Inc.
Rev. I