While I will not have any use for this service, I thought what one of the major French commuter railway lines is doing during travaux is an excellent example business-savvy, smart and ecological customer service.
The SNCF is doing construction on part of its rail line. And as a solution it is offering a payment system for people who utilize a carpool service.
The ad says you simply fill out your projected travel date and time, then offer your car up as a carpool option. When other people sign up to be in your carpool, you supply a code that's given and SNCF will pay you the price of that extra passenger.
Nifty. And practical for this holiday season!