We've been taking a look at the TT through the eyes of a travelling marshal.
Each year 8 people are chosen to take to the course, on bikes, before any competitors to make sure it's clear and that the circuit is ready for a practice or race to commence.
The highly experienced bikers play a vital role in the event as they are first on the scene to crashes.
Dick Cassidy is the number 1 Chief Travelling Marshal.
TT 2010 marks his 29th year in the job.
He told us he took a year out in the 1970's but never returned and instead took to marshalling.
He told 3FM his team are fully focused on the safety of the competitors and not what's going on in the race.
He described his role as the eyes and ears of the clerk of the course.
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