Sections of worn road on the lower side of the High Street are being improved as part of ongoing road works in the area.
Between Portland Street and Dixon Street, the central reservation is being removed, while islands will be built.
Ageing and damaged sections of the surface are also getting patched by Ringway, who were contracted by Lincolnshire County Council (LCC).
Peter Saxby, Senior Engineer at LCC, said: “The improvements have started well and we’ve been able to keep traffic moving through the area.
“We’re pleased to be taking the opportunity to resurface sections of the road as well, repairing worn areas alongside the areas of enhancements.
“These works will require the use of temporary traffic signals, but we’re planning to carry them out on the evening of May 21, subject to the weather, so as to lessen the effect on traffic.”
The current phase of works will also see new inset parking bays and footways will be repaved. From mid-July through the school summer holidays, work will begin at the Dixon Street junction.
The project promises improved traffic flows for motorists and reduced congestion. The scheme is expected to be finished by the end of October.