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Threemilestone

Project Overview

Vectos was commissioned to provide advice in relation to a mixed use development to the north of Threemilestone, Truro. The site is part of the strategic growth area for Truro, with proposals on surrounding land for a variety of uses.

The development proposals included 93 houses, an 80 bedroom hotel and 1,654 sqm of commercial units.

The development site is located immediately to the north of the A390; at the junction with the Truro Park & Ride (P&R), which sits to the west of the site and provides parking for approximately 1200 vehicles. Approximately 2 miles to the west of the site is the A30, which is part of the Strategic Road Network.

Vectos provided design advice to the client team on the initial masterplanning of the site, ensuring all elements of the development were accessible to all users.

Our Approach

Following discussions with both the Local Highway Authority and the Highways Agency (HA), a detailed Transport Assessment was undertaken which tested the impact of the development proposals.

The initial stages of the TA revealed that mitigation measures were likely to be needed at the P&R Roundabout. These junction improvements were subsequently designed and tested using a TRANSYT model of the A390 corridor.

Estimated traffic flows were provided to the HA and Cornwall Council for inclusion in strategic SATURN and Paramics traffic models of the A30/A390 corridor which included committed improvements at the A30 Chiverton Cross junction.

Discussions with Cornwall Council revealed an aspiration for the introduction of a new bus lane on the A390. Amendments to the scheme design allowed for this to be introduced along the frontage of the site, providing a significant benefit to the P&R.

Following a Public Exhibition held in Threemilestone, a new, at grade pedestrian crossing was proposed across the A390 to provide linkages to the village. An Interim Travel Plan was developed to encourage travel by sustainable modes for future residents, employees and visitors. Following negotiations with Cornwall, a Section 106 contribution was agreed, providing funding for required pedestrian and junction improvements.

The planning application was submitted in December 2012 and granted consent in March 2013.