You have the best situation there
You don't have to really worry about him getting into traffic
or into any real trouble
I would suggest clicker training with him
while on a lead
have a clicker in your hand
and give him treats every few secs or so
each time click on the clicker
do this in the house too so he gets the message ....
hey everytime I hear the clicker
I get a treat
and soon you'll have him running to you where ever and when ever you click the clicker