This one is a little tricky and you also need some luck. The best intersection I found is Blueclaw & 1st. Pick Rush Hour, because more cars will spawn. Position yourself in the middle of the road between the two holes and wait for the cars to pile up. You can use crashbreaker to hit certain cars or to find a better position. After 10-15 have piled up around you, wait for the first car to go on fire, then activate the crashbreaker while steering into one of the holes and hope you get at least 5 skillshots.