The details: The collision occurred at around 4.50pm on Monday 7th April, according to police.
The motorcyclist was taken to hospital, though the extent of their injuries has not been disclosed.
The road reopened just before 7pm after being closed for investigation work.
The incident caused significant disruption, with westbound traffic at Junction 52 halted for more than two hours.
What they're saying: Officers are particularly interested in dash cam footage showing "a van pulling a trailer at around 4.30pm."
The bottom line: Anyone with information can assist the inquiry by contacting Suffolk Police via their website (www.suffolk.police.uk/tell-us), email (SCIU@norfolk.police.uk) or by calling 101, quoting reference CAD 219 of 7th April.
