Work is set to begin on turning a 28-mile stretch of the A96 into a dual carriageway.
Two months of ground investigations between Hardmuir and Fochabers will get under way on Monday.
Transport Scotland said some traffic management measures would be put in place.
A spokesman said: “When completed, the scheme will provide better transport connections in Moray and to the wider transport network, bring relief to communities currently affected by through traffic and save over 20 minutes for road users travelling between Hardmuir and Fochabers.
“We apologise for any inconvenience these ground works may cause and would thank road users and local communities in advance for their patience.
“The contractor will closely monitor the operation of the traffic management measures to ensure that any delays are kept to a minimum.”