Driver suspected of negligence in traffic.
A driver calls the police due to the fact that the car in front is swerving strongly and also oscillating in speed.
The informant, who is driving on E4 at the height of Björklinge and heading south towards Uppsala, states that it is not possible to pass the car due to the driving.
A police patrol sees the car and is able to make a stop. The driver, a man in his 40s, is suspected of careless driving.