A district road engineer notes that more fatal crashes occur on the ten kilometres of state highway beside the town than on the twelve kilometres of ghat road above it, and concludes that the highway stretch is the more dangerous of the two to drive on. Which of the following, if true, most weakens the engineer's conclusion?

Danger to a driver is the chance that his own journey ends badly, and that is crashes measured against journeys made. Twice the crashes on nearly seventy times the traffic makes the ghat road far the worse road to drive on, so the engineer's figures, properly read, point the other way. The dates of resurfacing and which police station attends do not bear on how many vehicles pass, and the source of the register was never in dispute.