2
1 call start
1 return
1 call addCars xid "SFO" 300 30
1 return true
1 call addCars xid "SJC" 30 3
1 return true
1 call commit xid
1 return true
1 call start
1 return
2 call start
2 return
1 call addCars xid "SFO" 300 60
1 return true
2 call addCars xid "SJC" 30 6
2 return true
2 exit
