The current A3 route through Purbrook is very dangerous both northbound and Southbound.
From both directions, there are shared Bus/Cycle lanes, which approaching from the south stop at the roundabout, and from the north stop at the traffic lights before it.
When traveling Northbound, the uphill section past the shops results in a slower moving cyclist, generally holding up Traffic, which causes lots of aggressive, close overtakes, which in a narrow road when "sharing" with HGV's and buses, is not a pleasant experience. Many cyclists therefore jump onto the pavement if feeling unsafe, or do not cycle this section.
When travelling southbound, most of the time the traffic is slow due to queuing for the roundabout, but the narrow, on route cycle route squeezes cyclists between parked cars and slowly moving traffic, directly in the door zone.
Given the remainder of the A3 Portsmouth/London Road corridor is of signficicant benefit to those that commute from Denmead/Waterlooville/Clanfield area towards Portsmouth, this is a real bug bear.