Police say they'll work with marshals to prosecute people who venture onto closed roads.
They issued the warning after a number of reports this week.
Officers say riding, driving or walking onto the course while it's closed puts yourself and others at serious risk.
They say if you defy the law, you might find yourself appearing before the next available court.
Douglas fire festival cancelled
A winter fire festival planned for the Island's capital next weekend has been called off.
The Island's new Council of Ministers has been unveiled this morning.
Patrick commissioners' mission statement almost ready
Patrick commissioners say they've come up with seven issues to include in a new mission statement.
Douglas to mark its first Oie Houney fire festival
The Island's capital will celebrate a fire festival later this month.
New chief minister "first among equals"
The government's released a video featuring the new Island's chief minister.
Online passport applications to be cheaper than paper forms
The government says you'll soon be able to apply for a passport online - and save £13 doing so.
Two runaways on tram line since last January, says Manx Electric Railway
The Manx Electric Railway says it's had two runaway incidents in the last 21 months.
Engineers fixing burst water mains in Ballasalla
A burst pipe means low water pressure or no supply at all in the south of the Island this morning.
