Is this "Werrington Junction" - per description here: "The Scheme concerns Werrington junction, which is situated on the East Coast Main Line (ECML) at the northern edge of Peterborough’s urban area. In this location the Great Northern Great Eastern Line (GNGE) comes into the ECML from the direction of Spalding to the east and the Stamford Line run salongside the ECML on its western side"

https://assets.publishing.service.gov.uk/government/uploads/system/uploads/attachment_data/file/728707/network-rail-werrington-grade-separation-order-inspectors-report.pdf

I've added maxweightrating:hgv=7.5
maxweightrating:hgv:conditional=none @ delivery
to the A15 from Glinton rdbt to here. The restriction continues further south but I forget how far: probably to Taveners Road rdbt.

Unable to answer "How many lanes for cars does this road have?" for way/26486715 via StreetComplete 37.1:

Buses and bicycles only