Passengers will be able to stay in their vehicles on the Sound of Harris crossing.
Due to the Covid-19 situation, the Maritime and Coastguard Agency have agreed to temporarily relax its rules on passengers being able to stay in their vehicles during some ferry journeys.
Any passengers wishing to travel this way on these routes should check CalMac's website for eligible sailings.
"There has been some demand from passengers wishing to remain isolated in their cars while travelling with us. This change allows us to open up two more routes to this option of travel," said CalMac's Director of Operations, Robert Morrison.
The change does not affect any of CalMac's larger vessels where passengers are not permitted to remain in their vehicles.