The main route from the town centre towards Reading is shut while South East Water installs a water main as part of its ongoing £2million overhaul of the town's water system.
The road is due to be closed for a further six weeks but worried business owners have expressed their concern over the long-term impact the work will have on the town's customers.
Jason Oslar, from Oslar Coffee in Denmark Street, said: "It's definitely disrupted business and I think it's putting people off coming into the town.
"We've done ok but I've had customers coming in moaning about it every day of the week.
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