The Mountain Road reverts to two-way traffic this afternoon (Monday).
The now traditional one-way system has been in force from Ramsey Hairpin to Creg-ny-Baa throughout TT fortnight.
The traffic flow will remain one-way in the direction of the course until 10am, when the road will close for signs to be removed.
It will re-open with two-way traffic restored no later than 2pm.
The one-way system was introduced in 2007 to improve public safety and reduce the likelihood of head-on collisions.