If you have more than one vehicle in your family, it's no problem - you can add multiple vehicles on the Vehicles screen within the app.
There is no limit on the number of vehicles you can add.
How it Works
When a vehicle registered in the GoCarma app is detected in a toll transaction, the toll operator may query GoCarma for its HOV status.
Therefore, it’s a good idea to add any vehicle you regularly travel in on Dallas-Fort Worth TEXpress Lanes.
This will enable GoCarma to confirm the occupancy of each person in the vehicle, and enable the vehicle to qualify for an HOV toll discount.
Each person in the car should have the GoCarma app on their phone to be detected in the car. (If you travel with kids, there's an option for them too.)
Note: Only ONE person needs to add the vehicle into the app. This is often done by the toll tag account owner, but does not have to be.