13 © Centre for Economics and Business Research The Jacobs analysis seems to assume essentially similar behaviour patterns for vehicles in response to the proposed extension as for the current ULEZ. We have used these assumptions. We therefore assume that similar effects will take place for cars. This means that about half the vehicles will continue to make the trips and pay the charge, half will not which splits again roughly evenly into half suppressing their trips or shifting modally and half obtaining ULEZ compliant vehicles. Table 4