Designated driver is a business concept that could be implemented with dispatchers and drivers in every city.
It could be done very efficiently by allowing drivers to receive some substantial percentage of the margin after paying the drivers fuel etc. and for dispatch and related internal costs.
The First Version could be shared in an auction market or in a fixed price market on a regular basis every night.
Initially designated driver.com could use all independent drivers. Later the company could form a division to have its own drivers, perhaps.
The company could provide insurance for drivers and background checks for the insurance companies and do other details to make the process safer and easier for drivers customers and the company
Startup costs could be about $100,000 to proof of market and pricing starting in a city the size of Springfield or Worcester Massachusetts Providence or Orlando Florida.