The vehicles involved are limited to 12mph so delays are expected on the M5 and other roads.
A number of lane closures and full carriageway closures are planned for the M5 near Worcester.
The AA estimates that 21.7m journeys across the UK have been planned for Thursday.
Work to improve drainage on the M5 in Somerset is being paused after dormice were found on site.
The new junction will allow motorists to get on the M5 southbound at junction 10 for Cheltenham.
Concerns have been raised over the cost of two bat houses being built next to the M5.
The M5 scheme will help unlock land for 20,000 homes just outside Cheltenham.
Paiwand Siamand was caught speeding in a Volkswagen Golf R on a damp, unlit stretch of the motorway.
The southbound carriageway was closed as fire crews worked to extinguish the blaze.
