How F1 lap times are recorded

In F1, every thousandth of a second is crucial. Drivers' performances are often separated by less than the blink of an eye, so how are F1 cars timed so accurately?
To find out, Christian and Katie speak to James Clarke, a highly-trained F1 timekeeper. James explains the technology on cars and at circuits which make the timing system work, how lap times and race positions are accurately recorded, and what happens if two drivers set identical times.
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