The House of Commons Transport Committee is starting an enquiry into the Strategic Road Network. An important question is the magnitude of future demand for road travel, whether it will continue to grow in line with rising incomes, as the Department for Transport expects, or whether income is no longer an important factor, as the proponents of the ‘peak car’ idea argue, myself included. The Committee has commissioned a useful summary of the evidence from the Parliamentary Office of Science and Technology (POST) – albeit agnostic in its conclusions. We will see what the Committee makes of it.