Car wash estimated wait times on gas price billboard

If you’re driving home and you’re on a tight schedule but you can’t tell how long the lineup at the car wash is, having the estimated wait time automatically and constantly updated on the same billboard that the price is on would make the lives of those with little free time to spare better. The concept could be implemented by installing a number of induction loops underneath the driveway up to it to count the number of cars in line, multiplied by the average length of a car wash.