Qualifying also scheduled to take place this evening
Roads around the Mountain Course will close this lunchtime as a second contingency qualifying session will be used for this year's Manx Grand Prix and Classic TT.
The closures will come into force at 12.30pm, with bikes taking to the course from 1.15pm.
Roads are due to reopen by 4.30pm before closing again for this evening's practice at 6pm until no later than 9pm.
Yesterday afternoon's contingency session was also utilised, but the evening schedule was cancelled due to forecast heavy showers.
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