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Traffic impact study

A traffic impact study may be required to review a proposed access to a Regional road or anticipated traffic impact on the Regional road network. The traffic impact study shall be completed in accordance with the Region's Traffic Impact Study Guidelines (available for distribution upon request).

The following is a general terms of reference for all traffic impact studies. Not all elements listed below are required, and will be evaluated on a case-by-case basis. Formal terms of reference must be submitted to the Traffic Development Group prior to submitting a report.

Full description

The study must provide a full description of the proposed development. This includes, but is not limited to:

Traffic volume analysis

A traffic volume analysis must include:

Trip generation and distribution

A trip distribution and trip generation analysis must include:

Capacity analysis

The report must include capacity analysis completed in Synchro (version 7.0 preferred, but version 8.0 will be accepted as per the Highway Capacity Manual (HCM) 2000 standards and not the new HCM 2010 module). Unsignalized analysis can be completed in either Synchro or CCG Intercalc (2008 version at a minimum).
The following parameters must be used in either software:

For Synchro analysis, see Regional Guidelines for Using Synchro 7.0 (PDF) for other individual parameters. For CCG Intercalc analysis, saturation adjustments should include a complete breakdown of vehicle types by percentage (based on available data) and is to be documented in a table in the report.
The analysis must also include the identification of signalized intersections, unsignalized intersections and unsignalized accesses where:

All intersections that are modelled as signalized intersections (other than existing signalized intersections) must be supported by an Ontario Traffic Manual (OTM) Book 12 traffic control signals warrant, each one required to be included in the appendix of the TIS.

If traffic control signals are found to be warranted at a particular intersection in an earlier horizon year (e.g. 5 year horizon), a warrant is not required for the subsequent horizon year (e.g. 10 year horizon). The horizon year in which a particular intersection is warranted for traffic control signals must be documented in the text of the TIS. A roundabout feasibility analysis may also be required at the direction of Regional staff.

In Synchro unsignalized intersection analysis, if an unacceptable LOS ("E" or higher) and v/c ratio results on the minor approach in existing conditions analysis, the consultant shall conduct a gap study to establish an average value for gaps accepted (in seconds) and override the resultant value for the HCM-calculated critical gap in the Signing window.

For horizon year analysis with an existing two- lane road, if the road is forecasted to be widened to four lanes by the respective horizon year, the consultant shall override the resultant value for the HCM-calculated critical gap in the Signing window by inputting recommended values for critical gap of left-turning and right-turning movements onto a four-lane road as identified in the Ministry of Transportation, Ontario (MTO) Geometric Design Standards for Ontario Highways.

Sight Distance Evaluation

A review and analysis of the sight distance availability for all proposed accesses or roads is required. The sight distance requirements must be determined based on the most current standards and guidelines used by the Region of Peel. Available sight distance should be taken from actual field measurements to ensure accurate conditions.

Assess the sightlines based on the Region of Peel's standard practice, eye height and object height of 1.05 metres and 0.38 metres above road surface, respectively. The Region requires the access to meet the following sightline requirements:

Sight distances must be in accordance with the Transportation Association of Canada (TAC) Geometric Design Guide for Canadian Roads methodology. Folded full size and to scale drawings of the sightline analysis are required for our review and comment.


Identification of potential safety or operational issues must be reviewed that are associated with:

In addition, should the development be determined by Regional staff to be adjacent to a Regional intersection or road segment with significant collision history, most recent five-year collision data for the intersection(s) and/or road segment (s) must be reviewed and an assessment of the impact of the proposed development provided. Such information may be helpful to minimize any additional problems through the design or location of access points along the subject Regional road(s).

Please contactTraffic Safety staff for collision information.

Functional Design

A functional design detailing a recommended access configuration and/or proposed intersection geometrics may be required at the discretion of Regional staff.

Final Report

The following study structure is suggested:

The TIS should consist of a main document, supplemented by technical appendices containing detailed analyses as required.

The Region of Peel will require 1 copy to be in electronic format and 1 hard copy complete with the appropriate supporting documentation. This shall be submitted to the Traffic Engineering section of Public Works for our review, comment and approval.

All information submitted to Regional staff in connection with any Traffic Impact Study will be considered to be in the public domain.


The appendix must include:

Study Updates

From the date of submission, the Traffic Impact Study will have a "shelf life" of 5 years.

Where timing of subsequent development approvals exceeds 5 years, a new study will be required at the discretion of the Region of Peel.