A gantry spanning the motorway with blue overhead signs showing the following text.
Forward destinations: The SOUTH, London, Northampton M1 [Hollow triangle diversion symbol].
Exit destinations: A14 Felixstowe, Kettering [Hollow diamond diversion symbol].
Junction number: 19.
Junction 19 got a major upgrade in the 2010s, prior to which it would be charitable to have called it a national embarassment. It now provides free-flowing links to the A14 eastwards.
The real sign at this location uses the abbreviation "N'pton", which needs to be discouraged.