Definition: In this task, you will be presented with a passage and have to answer a question based on your understanding of the events inferred from the passage. Try to find the best answer that is most likely to fill in "_". Note that the URLs in the text have been replaced with [Link].
Input: A lorry driver who killed a 70-year-old man in a motorway pile-up after he fell asleep at the wheel has been jailed. Piotr Trojanowski, 41, crashed into the back of a van on the M5 near Burnham-on-Sea, Somerset, ramming the vehicle into another lorry in front. The driver of the van, John Horton, was killed instantly in the October 2013 smash. Shortly after the crash, Trojanowski told a witness, 'my boss is going to kill me. I think I fell asleep', the court heard. Trojanowski, of Yeovil, Somerset, was jailed for four-and-a-half years after being found guilty of causing death by dangerous driving following a trial at Bristol Crown Court.Lorry driver Piotr Trojanowski, 41, crashed into the back of a van on the M5He rammed the vehicle into another lorry, killing van driver John Horton, 70Trojanowski was jailed for four-and-a-half years at Bristol Crown Court 
 Question:A crash investigation revealed _ pulled up his lorry from 90kph to 1kph in 11 seconds, compared to the Argos lorry decelerating from 85kph to 1kph in 42 seconds.

Piotr Trojanowski