The good ol' beeb reports:

Figures highlighted by the Scottish Safety Camera Partnership suggested [car] accidents increased by nearly one-fifth on Friday afternoons.

Apparently it's going to become known as Fatal Friday Syndrome, and is attributed to "drivers switching off and speeding home after a long and tiring week at work"

Fatal Friday is said to be a world-wide phenomenon, with countries like America and New Zealand reporting similar findings.

Hmm, I think I'll stick to the bike trails this afternoon...