From the Kart Race Yearbook, App 4: The lower exposure action values are a) a daily or weekly personal noise exposure of 80dBA, b) a peak spl of 135 dBC.
The upper exposure action values are a) a daily or weekly personal noise exposure of 85dBA, b) a peak spl of 137 dBC.
The exposure limit values are a) a daily or weekly personal noise exposure of 87dBA, b) a peak spl of 140 dBC.
An employer who carries out work which is liable to expose any employee to noise at or above a lower exposure action value shall make a suitable and sufficient assessment of the risk from that noise to the health and safety of those employees, and the risk assessment shall identify the measures which need to be taken to meet the requirements of these regulations etc.
B.14.1 Officials: Every official and helper who is located close to the track should be issued with ear protection. This can be either earmuff style or disposable foam plugs style.
B.14.2 Competitors: it is highly recommended that every competitor wear ear plugs at all times when driving a kart.
B.14.3 Dummy Grid and after race collecting area: It is recommended that all personnel in the pit area use ear protection.
B.14.4 Dummy Grid, collecting area and Spectator Areas close to the track: Signs are recommended advising that ear protection is recommended, and advising a source to purchase such protection.
B.14.5 Ear plugs: Clubs should have supplies of disposable ear plugs for officials and for sale to spectators and drivers.
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