Section 7 Transportation Network Plan

7.1 Public Transit
7.2 Traffic Generation

7.3 Traffic Impact

The intent of the transportation network is to provide an integrated, multimodal transportation network for all residents and businesses that is safe, convenient, affordable and energy efficient.

The Transportation Network for the Leitrim Community is composed of a series of interconnected collector and local roads organized in a modified grid system to permit accessibility and flexibility of movement. The modified grid system provides good pedestrian access to the east-west and north-south major collector streets, while discouraging cut-through traffic. The major commercial, mixed use and institutional nodes are readily served by the road system and will minimize circuitous routing of transit buses. The Community Design Plan provides a high level of transit access and many routing options. This is an important consideration, as all residential and commercial areas are located beyond a 400 m walk to the proposed Leitrim Road transit station. There is sufficient capacity provided on the road network to accommodate projected internal and external traffic volumes. Employment lands are oriented toward major arterial roads to maximize visibility and access and are served by streets separate from the residential uses, thereby minimizing the potential for non-local cut-through traffic. A number of connections from the community to Leitrim Road are provided to minimize the peak traffic load on the north-south collector / Leitrim Road intersection and to better separate residential traffic and employment traffic .

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7.1 Public Transit

The City’s Official Plan has a City-wide target modal split of 30% for transit. The Leitrim Community Design Plan is planned to accommodate transit as an integral component of the community structure.

As described in Section 5.3, short to medium term bus transit service would be as follows:

  • South on Bank Street from Greenboro Station;
  • West on Blais Road;
  • North on the main north-south collector spine road;
  • East on the east-west road south of Leitrim Road; and,
  • North on Bank Street.

The route shall run clockwise so that residents who live west of Bank Street can walk to and from transit stops without having to cross the collector roads. This may require traffic signals at the intersection of Bank Street and the collector south of Leitrim Road to allow for a left hand turn onto Bank Street. In the longer-term, a possible bus transit route might be:

  • South on Bank Street from Greenboro Station;
  • West on Blais Road;
  • North on the main north-south collector spine road;
  • West on the extension of current Findlay Creek Drive;
  • North on Albion Road; and
  • West on Leitrim Road to the future light rail transit station.

Buses would return to Greenboro station over the reverse route. This route may require a traffic signal at the intersection of Blais Road and Bank Street to allow for a left hand turn onto Bank.

The City’s priority rapid rail transit corridor is the north-south extension of the O-Train corridor. The City intends to extend the current O-Train line so the North-South Light Rail Transit Corridor ultimately runs from the Nepean Town Centre to downtown Ottawa. This corridor forms the Leitrim Community’s western boundary west of Albion Road. Likely, there will be a rail transit station and Park & Ride lot at the corridor’s intersection with Leitrim Road, the specific location of which has not been confirmed. The City has initiated an Environmental Assessment study for the expansion of the North- South Corridor, which will determine, among other things, the appropriate corridor and identify locations for stations and parking lots. Completion of this

Environmental Assessment study is anticipated for 2006. The Leitrim Community Design Plan ensures that the community has good connectivity to the rapid transit stations. All major east-west and north-south collector roads will be designed to accommodate buses, and the connectivity of these collector roads to both Leitrim Road and to Albion Road will provide

OC Transpo with maximum flexibility with regard to both on-site bus routing and connections to the station via Leitrim Road. All new roads and widening of existing roads will include the accommodation for pedestrians and cyclists. A sheltered passenger waiting area, local service, transfer platform and bus lay-up areas would be included. Their implementation and use are key to meeting the Official Plan’s ridership targets.

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7.2 Traffic Generation

The proposed Leitrim Community contains approximately 7,000 jobs, 323,000 ft2 of commercial / retail development and 5,300 residential units of varying densities. Over 20 ha of institutional use has also been planned to serve the new community. Traffic generation rates for these land uses were based on National Capital Area data found in the TRANS Trip Generation Manual. These rates assume a non-automobile (transit / bike / walk) modal share of 25% to 30% for both office and residential uses, which is consistent with the Official Plan targets. For the afternoon peak hour, which is a worse case and accounts for the overlap between commuter trips, shopping trips and personal trips, the following trip generation rates were assumed:

 

For evaluation purposes, the Leitrim Community Design Plan was divided in 5 zones.
For evaluation purposes, the Leitrim Community Design Plan was divided in 5 zones.

Residential

  • 0.8 vehicles/hour/dwelling unit low density;
  • 0.7 vehicles/hour/dwelling unit for medium to high density;
  • 65% inbound, 35% outbound for low density;
  • 62% inbound, 38% outbound for medium to high density;
  • 20% of all trips remain internal to the community (shared trips)

Office

  • 0.28 vehicles/hour/job;
  • 10% absenteeism;
  • 50% peak hour factor;
  • 1.2 persons per vehicle;
  • 20% of all trips remain internal to the community (shared trips)

Retail

  • 5.0 vehicles/hour/1,000 ft2;
  • 80% of all trips are considered internal to the community or already passing by on adjacent streets

The following table summarizes the total and external vehicle trips generated by each zone of the Land Use Plan (opposite page). Institutional land uses were assumed to generate a high proportion of internal trips which would not occur coincident with the commuter peak, and thus assumed to be negligible from the perspective of sizing the road network.

Zone

Total PM Peak Traffic

External PM Peak Traffic

 

Inbound

Outbound

Inbound

Outbound

1

47

47

9

9

2

838

1,332

497

892

3

413

299

241

150

4

1233

835

813

495

5

682

431

477

277

Total

3,213

2,944

2,037

1,823

As shown in the above table, the projected peak hour traffic generation added to arterial roads is 3,860 vehicles per hour, 2,037 vehicles per hour inbound and 1,823 vehicles per hour outbound. This external traffic represents approximately 60% of the total unlinked (single origin to single destination) trips generated by the community.

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7.3 Traffic Impact

Traffic impact was assessed at a macro level using the following blended peak hour trip distribution:

  • 25% to/from the west via Leitrim Road;
  • 30% to/from the north via Albion Road;
  • 25% to/from the north via Bank Street;
  • 15% to/from the east via Leitrim Road;
  • 2.5% to/from the south via Albion Road; and
  • 2.5% to/from the south via Bank Street

The macro-level distribution reflects the location of the Leitrim Community relative to the Official Plan’s projected distribution of employment and residential uses, as well as planned regional transportation links between them. External traffic was assigned to the road network on a zone by zone basis, using the closest routing to reach their macro-level destination. By superimposing traffic to/from all of the zones onto the proposed Community road network, the projected two-way link volumes were checked to ensure they were consistent with the intended function of the major streets. The capacity of a major collector street is 800 vehicles per hour to 1,200 vehicles per hour, two-way total. The two highest volume roads were found to be Findlay Creek Drive (900 vehicles per hour), which connects Bank Street to Albion Road, and the north-south link (1,100 vehicles per hour) which bisects the community and connects to Leitirm Road midway between Bank Street and Albion Road. Both of these streets should be designed as major collector roads given their projected traffic volumes, the land uses that will have direct access to them, and their function in moving both internal and external traffic volumes through the Community. The next highest volume street is the eastwest link immediately south of Leitrim Road (500 vehicles per hour), which serves a mix of employment and residential uses in Zone 2 and connects to both Bank Street and Albion Road. The remaining connections to the arterial road network (serving Zone 3 and Zone 5) are forecast to carry peak volumes of under 200 vehicles per hour, consistent with a minor collector or local street function.

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