Driveway width regulated by the City. Because you have service lateral under the ground to your house, it has to be 1.5 m away from your driveway. And also the width of the driveway cannot more than 50% of your frontage of the lot.
Interlock considered as the landscape element. So there is no regulation on it. You could do it. But you still should be aware of your service location. Normally it is not pertected for the weight of vehicle.