Street Design Manual

Scenarios: Analyses shall be submitted for each of the following scenarios:

Table 7.3 Analysis Scenarios Scenario

Rezoning

Site Plan/ Other

Existing Year

Yes Yes Yes Yes

Yes Yes Yes

Background/Horizon Year Build-out under current zoning Build-out under proposed zoning

No

Build-out in phases

No

Yes Yes

Build-out with proposed mitigation No

Traffic Analysis Default Values: The existing cycle length, signal offsets, splits and phasing scheme for all traffic signals within the study area shall be maintained for all analysis scenarios. Traffic models shall match the signal plans with respect to detector size, detector location and all other detector settings unless it can be demonstrated that the detectors have been field adjusted to other values. All nodes and links within the traffic models shall be accurately located based on NC Grid Coordinates.

Microsimulation programs, such as SimTraffic, shall use a seed time of 10 - 15 minutes and a recording time of 60 minutes. The resulting performance measures shall be averaged over at least 10 simulation runs.

Under Options>Intervals and Volumes set the SimTraffic Parameters as follows:

Table 7.4 Simulation Settings Intervals 0 1

2

3

4

Interval Name

Seeding

Grow

Peak

Stabilize

Recover

Duration (minutes) Record Statistics

10 - 15

15

15

15

15

No

Yes

Yes

Yes

Yes

Growth Factor Adjust

No

No

No

No

No

PHF Adjust

No

No

Yes

No

No

Anti-PHF Adjust

No

Yes

No

Yes

Yes

Raleigh Street Design Manual – Page 52