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DeNovo Planning Group
Appendices Prepared for
Prepared by
PC-3 Joerger Ranch Specific Plan
Traffic Impact Analysis
APPENDIX A
PC-3 Site Plan
APPENDIX B
Level of Service Criteria
DESCRIPTIONS OF LEVELS OF SERVICE
The concept of level of service is defined as a qualitative measure describing operational conditions
within a traffic stream, and their perception by motorists and/or passengers. A level of service definition
generally describes these conditions in terms of such factors as speed and travel time, freedom to
maneuver, traffic interruptions, comfort and convenience, and safety. Six levels of service are defined for
each type of facility for which analysis procedures are available. They are given letter designations, from
A to F, with level of service A representing the best operating conditions and level of service F the worst.
Level of Service Definitions
In general, the various levels of service are defined as follows for uninterrupted flow facilities:
$ Level of service A represents free flow. Individual users are virtually unaffected by the presence of
others in the traffic stream. Freedom to select desired speeds and to maneuver within the traffic
stream is extremely high. The general level of comfort and convenience provided to the motorist,
passenger, or pedestrian is excellent.
$ Level of service B is in the range of stable flow, but the presence of other users in the traffic stream
begins to be noticeable. Freedom to select desired speeds is relatively unaffected, but there is a slight
decline in the freedom to maneuver within the traffic stream from LOS A. The level of comfort and
convenience provided is somewhat less than at LOS A, because the presence of others in the traffic
stream begins to affect individual behavior.
$ Level of service C is in the range of stable flow, but marks the beginning of the range of flow in
which the operation of individual users becomes significantly affected by interactions with others in
the traffic stream. The selection of speed is now affected by the presence of others, and maneuvering
within the traffic stream requires substantial vigilance on the part of the user. The general level of
comfort and convenience declines noticeably at this level.
$ Level of Service D represents high-density, but stable, flow. Speed and freedom to maneuver are
severely restricted, and the driver or pedestrian experiences a generally poor level of comfort and
convenience. Small increases in traffic flow will generally cause operational problems at this level.
$ Level of service E represents operating conditions at or near the capacity level. All speeds are
reduced to a low, but relatively uniform value. Freedom to maneuver within the traffic stream is
extremely difficult, and it is generally accomplished by forcing a vehicle or pedestrian to “give way”
to accommodate such maneuvers. Comfort and convenience levels are extremely poor, and driver or
pedestrian frustration is generally high. Operations at this level are usually unstable, because small
increases in flow or minor perturbations within the traffic stream will cause breakdowns.
$ Level of service F is used to define forced or breakdown flow. This condition exists wherever the
amount of traffic approaching a point exceeds the amount which can traverse the point. Queues form
behind such locations. Operations within the queue are characterized by stop-and-go waves, and they
are extremely unstable. Vehicles may progress at reasonable speeds for several hundred feet or more,
then be required to stop in a cyclic fashion. Level of service F is used to describe the operating
conditions within the queue, as well as the point of the breakdown. It should be noted, however, that
in many cases operating conditions of vehicles or pedestrians discharged from the queue may be
quite good. Nevertheless, it is the point at which arrival flow exceeds discharge flow which causes
the queue to form, and level of service F is an appropriate designation for such points.
APPENDIX C
2012 Intersection Level of Service Output
2012 No Project
2012 with PC-3
APPENDIX D
2032 Intersection Level of Service Output
2032 No Project
2032 with PC-3
APPENDIX E
Intersection Level of Service - Mitigated
PC-3 2012 Mitigated
PC-3 2032 No Pro Mitigated and
PC-3 2032 Plus Pro Mitigated
APPENDIX F
Conceptual Layout for Left-Turn Lane on
Donner Pass Road at Glenshire Drive