17.2.10 Trunk Road Economic Assessment Database (TREAD)

The Trunk Road Economic Assessment Database (TREAD) contains details of trunk road scheme economic assessments at different stages of the assessment process. It contains links to all current Traffic and Economic Evaluation Report (TEER) forms which give detailed information associated with the economic assessment such as Net Present Values (NPVs) and Benefit Cost Ratios (BCRs).

In addition, TREAD contains copies of Transport Scotland's TRIPS Design & Construction Division's Quarterly Scheme Progress Reports which detail the status and progress of all the schemes within DCD's trunk road programme. TREAD also contains summary details from DCD's Annual Before and After Monitoring Reports.

Sources:

The main sources of information contained within TREAD are:

• TEER forms;
• Quarterly Scheme Progress Reports; and
• Annual Before and After Monitoring Reports.

Data Availability:

The following information and data is available from TREAD:

• Scheme details i.e. carriageway standard, length, construction start date & construction period etc.
• Scheme economics including costs, NPV, BCR etc.; and
• Before and After Monitoring data including traffic flows, accident details, environmental mitigation measures, etc.

Format of the Data:

TREAD is a Microsoft Access database. Extracts from the database are supplied either on paper or in electronic format suitable for input to spreadsheets.

Data Use:

The data from TREAD can be used to:

• Determine what trunk road schemes may be planned within an area of interest and their current status;
• Examine the economic assessments of schemes at different stages i.e. pre-feasibility; pre-order publication; pre-tender; and post tender, including the current and previous quarter's total scheme costs; and
• Examine the accident savings associated with different schemes.

Data Access:

TREAD can be accessed through Transport Scotland.

Cost:

There is no charge to Local Authorities for data extracted from TREAD.

Contacts:

The contact for TREAD is:

Gerard McPhillips, Transport Scotland, MTRIPS, Standards, Traffic & Economics Branch.

Email gerard.mcphillips@scotland.gsi.gov.uk