Local Use of TRICS: A Case Study from a User’s Perspective

Ewan Anderson, Fore Consulting Limited

Contents

Two examples of recent projects: Harlow Grange, Harrogate (124 dwellings). Clifton Gate, York (3,400 dwellings).

Look at where TRICS works well and where it is currently limited. Is TRICS appropriate when working on

large/strategic sites?

Some questions for TRICS (and users) going forward.

Project 1: Harlow Grange, Harrogate

Overview

Proposed development of 124 residential dwellings.

Approximately 3.0km southwest of Harrogate Town Centre.

Immediately north of B6162Otley Road.

Use of TRICS

TRICS used to derive average person trip rates (‘Multi-Modal Total People’) for the proposed development.

Database interrogated for sites based on the following criteria:

Land Use 03 – Residential

Category A – Houses Privately Owned

Location Edge of TownTrip Rate Parameter

Number of dwellings

Range Selected by User

93 to 155 Dwellings (ie +/-25% of the proposed development)

Actual Range 98 to 155 Dwellings

Survey Days Monday to Friday

Travel Plan No

Calculation Factor 1 Dwelling

Use of TRICS

Estimation of vehicular trip rates: Person trip rates from TRICS applied to the car driver mode share for

the local ward. Harlow Moor ward (‘Method of Travel to Work’, 2011 Census) = 64%.

TRICS is considered to work well for projects of this type. Large number of similar sites available. Options to tailor search criteria to match proposed development.

Land Use Unit

Trip Rates (Vehicles/per unit)

Weekday AM Peak Hour

Weekday PM Peak Hour

ArrivalsDeparture

sArrivals

Departures

Residential 1 Dwelling 0.146 0.521 0.391 0.221

Project 2: Clifton Gate, York

Overview

Located: North of the

A1237 Outer Ring Road at Clifton Moor.

Approximately 5.0km northwest of York City Centre.

140 hectares of land.

Overview

Proposed development of 3,400 residential dwellings.

A draft allocation in the City of York Local Plan.

Sustainable new settlement, including: Local facilities. Social infrastructure. Convenience retail. Park & Ride and regular bus service to city centre.

Use of TRICS

Used the same approach to deriving person trips rates as for the previous example.

Provides similar search criteria: Residential, Houses Privately Owned, Edge of Town, etc.

However, very few large residential sites within TRICS database.

Comparison of vehicular trip rates between the two projects:

Project

Trip Rates (Vehicles/per unit)

Weekday AM Peak Hour Weekday PM Peak Hour

ArrivalsDepartur

esTotal Arrivals

Departures

Total

Harlow Grange

0.146 0.521 0.667 0.391 0.221 0.612

Clifton Gate 0.181 0.534 0.715 0.384 0.243 0.627

An Alternative Approach

Origin-Destination Survey of proxy area. ANPR cameras

covered all vehicle routes into Haxby and Wigginton.

Excluded ‘through’ traffic movements.

Counted all residential dwellings.

Site (Red) Proxy (Blue)

Comparison of Trip Rates

Issues from the comparison Does the use of TRICS accurately

provide trip rates for large/strategic developments, at present?

If not, can TRICS respond to this challenge moving forward, or do we need to adopt a different approach to deriving trip rates for these sites? For example, by desegregating trips by

journey purpose.

A Local User’s Perspective Increasingly working on more large-scale, strategic sites.

Brought about by changes to the national policy framework. Changes to planning policy through NPPF. DfT Circular 02/2013 Sites being promoted through the Local Plan process.

If not, does the use of TRICS become a barrier to development? Overestimating the traffic generation and traffic impact on the

highway network. Extent of study area to be assessed. Mitigation schemes required.

Questions for TRICS going forward

Does TRICS need to expand its database to include more large/strategic sites?

If so, how feasible is the collection of accurate data for these sites? The internalisation of trips. Multi-modal trip rates. Phasing and build-out (10- years).

And how can these sites be integrated into TRICS?

Local Use of TRICS: A Case Study from a User’s Perspective

Ewan Anderson, Fore Consulting Limited