Boy meets girl (in the most unusual way)

Returning from Bocca, a club on the beach, one Sunday morning at half past four:

Driving back home, boys in car A see girls in car B. Actually, boy A1 sees girl B2 (and vice versa, as she told him later).

In the traffic, car A overtakes car B. Five minutes later, car B overtakes car A.

And just when car A is catching up for an undertake and has to turn right, boy A1 takes out a his card and gives it to girl B2, while driving at 80 kph.

One minute later B2 calls A1. One day later A1 and B2 meet each other, go out, have fun.

Wow! What were the odds of that?