Google Maps Route Generator Plugin

Are there any google map plugins that allow for the public user to select several points and have it generate a route for them?

Essentially the site will be a collection of businesses that the public user can go to. They need to be able to pick from some of those points and generate a route for those selected points. I’m housing the directory of businesses and the public user is selecting from them a custom list that they want to see.

I’ve taken a look at plugins like Google Maps Travel Route, CP Google Maps, and WP Google Maps. The first will let me create a map that has a route, but it’s not controllable by the public. It’s whatever the admin sets up. I don’t think CP google maps does it either. It’s either all points are on the route or nothing. WP Google Maps doesn’t seem to support route generation.

Am I right in assuming such a solution doesn’t currently exist?

It can be free or paid. It doesn’t matter.