The Aberystwyth depot for Arriva Buses Wales will close today, alongside those in New Quay, Lampeter and Dolgellau.
The company says the period of instability regarding public transport funding - together with spiralling fuel costs, has put unsustainable financial pressure on their Aberystwyth operations.
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It will be a dry start to the day and any fog and low cloud will be slow to clear. Sunny spells will develop into the afternoon.