Motorcyclist's injuries "potentially life-threatening" after Wellingborough A45 crash
Emergency services rushed to the eastbound stretch of the major road towards the Turnells Mill Lane junction in Wellingborough at about 7pm.
The crash involved one vehicle, a Suzuki GSX-R750, and it is not yet known how he lost control.
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Hide AdThe rider of the motorbike, a man in his late 30s, is currently at University Coventry Hospital.
The road was closed for about six hours but has since re-opened.
Witnesses or anyone with information or dashcam footage should contact police on 101 or the Drivewatch Hotline on 0800 174615.