Incredible.
I don't think that would be enough to stop a 1.7 tonne car. Maybe in the interim some sort of fencing would help, but I think you should plant a couple of trees in the front yard to give protection in the long term. Plus, fencing is ugly if it is tall, solid and impervious imo.
I would recommend the following types of vegetation, personally:
Eucalyptus Melliodora (Yellow Box)
Eucalyptus Leucoxylon (Yellow Gum)
Eucalyptus Corymbia (Red Gum)
Perhaps some smaller Acacia Impleca (Lightwood).
In addition to providing a level of protection, the planting of these trees would provide some screening of the property from the street and provide shade, habitat etc for native animals. My house is covered in large native trees, and the bird are simply beautiful. Very calming and relaxing to sit on the verandah and listen to them going about their business. Feels like i'm in the bush, yet i'm still only 30 mins from the CBD.