Atkins’ TIF Studies Graham Bown

Introduction Based on experience of Cambridge TIF and Bristol TIF 25/04/2019 Atkins' TIF Studies Introduction Based on experience of Cambridge TIF and Bristol TIF General modelling discussion plus SATURN based experience: Data Segmentation Guidance Charging schemes Practical issues Appraisal

Data Roadside data not previously collected with income ranges 25/04/2019 Atkins' TIF Studies Data Roadside data not previously collected with income ranges Data collection needs to consider complementary measures The risk of collecting insufficient evidence to support a different hierarchy from the WEBTAG default is considerable

25/04/2019 Atkins' TIF Studies Segmentation TIF specified income and purpose segmentation leads to larger number of user classes There is requirement to show validation of segmented base year

Guidance Very comprehensive (demand and local models) 25/04/2019 Atkins' TIF Studies Guidance Hierarchy structure in WEBTAG related to major urban conurbations Freestanding mono-centric sub-region may be different Very comprehensive (demand and local models) Although most is still at the consultation stage “It is clear that the more advanced parts of the guidance have not yet been used by scheme promoters designing road pricing schemes” (DfT, WebTAG Consultation Documents page)

Guidance MECC / MSC Provides theoretical optimisation calculation 25/04/2019 Atkins' TIF Studies Guidance MECC / MSC Provides theoretical optimisation calculation Of limited practical use to politicians or for objective setting May be a useful measure of efficiency against theoretical optimum

Charging schemes Link based Cordon 25/04/2019 Atkins' TIF Studies Charging schemes Link based Cordon Point of use cordon type charges are easy to model Area licence systems Need to consider Trip chaining Use of ring road / bypass – multi-charge Discounts Study areas for area wide charging schemes may need to be very large

Practical Issues for Charging 25/04/2019 Atkins' TIF Studies Practical Issues for Charging Matrix or network based? Through trips and trip chains Remember tolls in SATURN are per pcu not per vehicle or person! For simplicity it will be desirable to code tolls as money costs Use of $INCLUD files for tolls will facilitate easy testing of alternative toll regimes/levels with the same network file.

Appraisal Business model: Declaration - low frequency users 25/04/2019 Atkins' TIF Studies Appraisal Business model: Declaration - low frequency users Express Declaration (with registration) Fleets - organisations with more then 10 vehicles using the scheme Disabled Persons or Zero VED based exemption Enforcement Residents discount registration fees Toll skims

Wider Picture Scheme optimisation Complementary measures Alternatives 25/04/2019 Atkins' TIF Studies Wider Picture Scheme optimisation Complementary measures Alternatives “Big ticket” items Smarter choices Solutions to problems on toll boundary Social inclusion and equity

Thoughts Onerous – a lot of data, modelling and requirements 25/04/2019 Atkins' TIF Studies Thoughts Onerous – a lot of data, modelling and requirements Challenging – cutting edge, complex, tight deadlines Interesting – theoretical, practical, political