@Sjoerd - very interesting. I have never heard of this bug swarm but "yuck" and good to know what and when to avoid! Having to drive through that type of active swarm would be - well interestingly awful in a yucky yet fascinating type of way. I was in Trinidad once when a swarm of termites emerged. They covered everything and came in every teeny tiny crack they could squeeze into. Even through the keyhole of the old Guest house I was staying in. The swarm only lasted a few hours and by the next morning it was totally gone and many of the bugs already eaten.
That is an interesting experience IL. We get flying ant swarms twice a year here. You can tell it is happening because there is a huge flock of sea gulls that circle above where the phenomenon is occurring. Yeah though--those green mozzies really do mess up one´s auto.
