Hardly, it's mostly just blind luck, but sometimes if you go quick enough you'll avoid disturbing the traffic flow too much and won't cause any crashes.
Thanks for the expansion feedback. I was considering the possibility of expanding, I definitely wanted to add semi trucks and other vehicles to this game but as the jam went on I realized there wouldn't be enough time before the deadline. I definitely wanted to add explosions too but I don't think I have the artistic proficiency to do that. maybe if I find a fitting xkcd-style animated explosion sprite somewhere for free.
One of the features that I came up with during development and want to add if I end up expanding is that I'll make the game take snapshots at different times during gameplay (the first time you make a car swerve, crossing the middle, crossing the end, etc), and then at the end of each scenario you get a sort of xkcd-style comic strip with three or four panels that shows the events of what happened while you were playing that round.