The company has been supporting the arts for years and has a Poetry Bus and Gallery Bus among the themed vehicles in its fleet.
Now it is helping to drive the annual festival forward by linking up with the Bournemouth Council organisers.
The festival takes place in venues around the town from October 8 to October 15 and includes music, dance, poetry, theatre, film, and installations.
There is a packed programme with most of it completely free and the Yellows will be helping the visitors get around.
Fiona Harwood from the Yellows said: “We are well-known for supporting the arts and have had poets and artists in residence on our buses.
“The resulting Gallery and Poetry buses are extremely popular and it shows us what appetite there is for the arts.
“We’ll be carrying programmes on the buses and helping passengers and visitors get to the right venues.”
Those venues include the Bandstand in the gardens, Arts University Bournemouth, The Triangle, Bournemouth Square, Lower Gardens, Pier Approach, Central Gardens, The Shelley Theatre, The Pavilion and several churches.
Andrea Francis from the Arts by the Sea Festival, which is funded by Bournemouth Borough Council and Arts Council England, said: “This is our sixth annual festival and there is something for everyone.
“Our website gives all the information and allows people to search what’s on. And we hope they’ll use the Yellows to get around.”
Pic caption: Artsea people: (l-r) Libby Battaglia from the festival, Amy Lee Foot from the Yellows, Andrea Francis and Roxy Robinson from the festival and Fiona Harwood from the Yellows.