Construction workers doing repair work on London, England’s Millennium Bridge took no chances and hung a bale of Hay from the bridge in accordance with a centuries-old, yet-to-be-rescinded law, the Daily Mail reports.

The ancient law required anyone doing bridge repair work that reduced the headroom (the amount of space between the bottom of the bridge to the water) to hang a bale of hay as a warning to boats passing underneath.

The law is still found in a list of regulations published by the Port of London Authority in 2012.

The bale was required as an emergency repair on the city’s infamous bridge ended up reducing the headroom.

READ: Bale out! Workers dangle bale of hay from Millennium Bridge as they carry out urgent repairs – to make sure they are not breaking ancient by-laws requiring workers to warn river traffic below

This is not the only bizarre law on the books in England. Up to a decade ago, it was legal to kill a Scotsman in York, if he was carrying a bow and arrow. There was just one limitation, you couldn’t kill him on a Sunday.

But other laws still remain. For example, it is still against the law for anyone to die in Britain’s Parliament buildings. It is also still illegal to eat mince pies on Christmas Day in England and to stick a postage stamp upside down on an envelope that bears the image of Royalty.

Some of these bizarre laws, which may have made sense at the time they were written, are still subject to the ‘doctrine of implied appeal.’ This law was passed to potentially overrule the thousands of ancient laws passed over the centuries that may still be on the books, but no longer apply today.

READ: You can still kill a Scotsman in York, but don’t eat a mince pie at Christmas