Talks aimed at averting a strike by fuel tanker drivers will resume on Tuesday after "constructive" discussions were held before Easter.
Leaders of the Unite union spent two days last week meeting officials from six distribution firms to try to resolve a dispute over terms and conditions and health and safety.
Acas chief conciliator Peter Harwood said as the talks were adjourned: "The discussions have been constructive, with the parties positively engaged and committed to the process.
"We are pleased that they have agreed to continue their discussions with Acas."
He added: "Of course, everyone will be respecting the confidentiality of the process. Therefore, no further comment will be made by any of the parties involved."
The dispute over terms and conditions and health and safety has been brewing for more than a year but flared up last month when Unite announced that workers in five firms had voted to strike.
As Aslef's annual assembly of delegates begins in Edinburgh tomorrow the general secretary explains the challenges his members - and workers across the country - face