So before the Revelius Update, you could use the Dursley's car outside Kings Cross to get to Mundane Lane. However, it isn't now possible and the only other way to get to Mundane Lane (other than flying/walking) is through the Knight Shuttle, which teleports you not very close to the Dursley's house. If the travel between the car and Mundane Lane was available before, I think it should still be available to make travelling easier,