This chart shows the price of Brent crude over the past 12 months both in US dollars and pound sterling. Hover over the lines to get precise data values.
This chart tracks the changes in petrol and diesel prices over time (weekly, rolling ten year period) and is based on DECC data published each Tuesday.
Four years after the government launched a £5,000 grant scheme for buyers of the most eco-friendly cars the battery-powered Nissan Leaf is the number one green car on the road.
Analysis of DVLA data by the RAC Foundation shows that at the end of 2014 there were 6,838 Nissan Leafs licensed in the UK.
This chart plots, by model, the number of licensed cars in Great Britain that are eligible for the government's Plug-in Car Grant scheme.
Hundreds of thousands of drivers are likely to have been illegally penalised for overstaying their welcome whilst parked on private land. The motorists could be entitled to repayments totalling many tens of millions of pounds if a court finds in their favour.
This paper by Tom Worsley and Peter Mackie investigates the interaction and tensions between transport policy, the appraisal process and decision-making.