Emma Sheppard admits using homemade stinger on police cars
A woman has admitted putting down homemade stinger devices that damaged the tyres of three police vehicles near Bristol.
Emma Sheppard, 33, faced three charges of conspiring to commit criminal damage, reckless to endanger life, following the incident in December.
Sheppard, of no fixed abode, was warned by judge Martin Picton at Bristol Crown Court that she faced jail.
She was remanded in custody and will sentenced on 24 February.
Avon and Somerset Police said: "Emma Sheppard placed these purpose-built devices in the road, knowing full well what the consequences could be.
"They posed a serious risk to our police officers as well as other road users and formed part of a reckless and dangerous plan."