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Local Use of TRICS: A Case Study from a User’s Perspective
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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 – ResidentialCategory A – Houses Privately OwnedLocation Edge of TownTrip Rate Parameter Number of dwellingsRange Selected by User
93 to 155 Dwellings (ie +/-25% of the proposed development)
Actual Range 98 to 155 DwellingsSurvey Days Monday to FridayTravel Plan NoCalculation 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 Arrivals Departure
s Arrivals 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
Arrivals Departures Total Arrivals Departur
es TotalHarlow 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