Bus Vannin says delays to racing may disrupt bus services today.
On its Facebook page, the organisation says some of its services may be subject to disruption or cancellation at short notice.
Roads were due to close at 9.30am today, but poor weather means they won't shut until at least 11.30am.
It's apologising for any inconvenience to passengers.
Parcels face customs charges under new EU rules
Number of police searches rises by nearly 37 percent
Broad to stand for Ayre and Michael
Road to beauty spot temporarily closed from today
Politician to query government income from medical cannabis
Police appeal over prom incident
Christian to defend seat
Police ask people to avoid Mountain Road after supercar crash