But the news isn't too bad, with both of them only expected to cause slight delays, of under 10 minutes.
The latest expected works list, with notes from National Highways, shows that two closures are due to start over the next two weeks:
• A3, from 9pm September 21 to 6am October 7, slight delays (under 10 minutes): A3 both directions Hindhead Tunnel, Contraflow for maintenance works.
• A3, from 8pm October 2 to 6am October 6, slight delays (under 10 minutes): A3 northbound and southbound, Hindhead Tunnel, Contraflow for tunnel maintenance, diversion via Highways England network.
National Highways is responsible for maintaining motorways and major A-roads, so closures of smaller roads will not be included in their schedule.