The collision happened in Hacton Lane just before 3pm (credit: Google Maps)
Emergency services were called to Hacton Lane, near Bevan Way, at around 2.50pm today.
An air ambulance was also sent to the scene and a woman, aged in her 40s, was treated at the scene by paramedics.
A spokesperson for the Met Police said: “She was taken to hospital for further treatment and at this stage her condition is being treated as potentially life-threatening.
“The road is closed in both directions and closures are also in place at Bevan Way and Derby Avenue.”
The closure is causing delays around Hornchurch and Upminster.
For more on this story, and the latest on our other local and national news, listen to Time 107.5FM
Tags: Havering, Hornchurch