A huge new motorway bridge will be lifted into place over the M27 this weekend.
The new bridge weighs 1,069 tonnes – as much as 15 space shuttles - and will be lifted into place by remote-controlled lorries.
The bridge was built in a compound near to the motorway to prevent months of overnight closures of the M27.
The bridge deck is 47 metres long and 16 metres wide.
The work is part of a Highways England project to replace the bridge that carries the A3057 Romsey Road over the M27 northwest of Southampton and is the second of three weekend closures allowing the old bridges to be demolished and the new one installed.
The M27 between junction 3 (for Southampton City Centre) and junction 4 (for the M3) will be closed from 10pm on Friday night (June 28) and reopen at 5am on Monday (July 1).
Highways England project manager Andrew Winson said: “The installation of the new Romsey Road bridge marks a major milestone in this scheme and is the next step towards opening a brand-new bridge for people in the area and users of the A3057.
“Our approach to replacing this bridge has meant that we can avoid months of disruption on the M27 and carry out the big operations over three weekends, spread out over time.
“But, while this means less disruption overall, closing the M27 will inevitably cause disruption this weekend, so I strongly urge drivers to plan ahead and avoid the area if possible.
“The weather is expected to be very warm this weekend, so if travelling by car, please take some extra water on your journey just in case the diversion routes are busy, which they are expected to be.”
While the motorway is closed, Highways England will also carry out routine maintenance.
Signed diversion routes will be in place throughout the weekend, with separate routes for heavy vehicles.
* Light vehicles will be diverted via M3 junction 11 down the A3090 through Romsey and down the A36 to M27 junction 2
* Lorries will be diverted off at M27 junction 5, along the A27 to Chilworth roundabout, then along the A27 through North Baddesley, down the A3057, onto the M271 and re-joining the M27 at junction 3.
*Light vehicles on the M27 originating from the A31 heading to London/M3 will be diverted off at M27 junction 2 to use the A36 and the A3090 through Romsey towards M3 junction 11
*HGVs on the M27 coming from the A31 heading for M3/London will be diverted off the above route at Romsey. It will be directed onto the A27. These *HGVs will then route through North Baddesley to Chilworth Roundabout, where they will pick up the A33 to join the M3 northbound. (This is to avoid the low bridges on the A3090.)
*Traffic of any type on the M27 coming from the A31 and heading towards M27 east (e.g. from Bournemouth to Portsmouth) will be diverted off at M27 junction 3 to head up the M271 and A3057 northbound. Traffic will then be diverted, before it reaches Romsey, to join the eastbound A27, heading through North Baddesley and Chilworth Roundabout to re-join the M27 at junction 5.
The Romsey Road bridge is being replaced because it is nearing the end of its life.
Two narrow older bridges are being replaced with a single new one, designed to last 120 years.
Work started in September last year when the first of the two old bridges was demolished, with traffic on the A3057 directed over the other bridge. With the new bridge in place, work will begin to get the new bridge ready for traffic, and the final remaining old bridge will be taken down in another weekend’s work expected to happen towards the end of the year.