From Daily Mail UK:

After two years and £250,000, they found that ten-pin bowling alleys up and down the country could be a 'very dangerous' environment for families.

They concluded that it was too easy for children or teenagers to run down lanes and get trapped in machinery that sets up the pins - even though there was no record of any such accident having happened.

The bizarre Health and Safety Executive report found that members of the public would be at risk if they walked along the 60-foot lanes to knock over pins by hand.

Its authors even considered ordering every bowling alley to put barriers across lanes. But they were forced to admit defeat - after realising that bowlers must be able to see what they are aiming at.

...

The HSE inquiry was begun after a technician was crushed to death in 2006 in Barking, East London, when a pin-setting machine was mistakenly left plugged in.

The two-year investigation also concluded that staff must wear earmuffs to mask the noise of balls hitting pins.

An HSE spokesman said: 'The investigation revealed that the machinery used nationally in bowling alleys did not have adequate safety features.'