A Polish motorist died Wednesday after crashing into a United States military truck on a motorway in western Poland, where large-scale Nato war games are underway. "The car's driver died while the passenger was injured," said Wojciech Kaliszczak, a spokesman for the Anaconda-16 manoeuvres involving 31,000 troops from 24 Nato and partner states. "The large (US military) truck was travelling in a convoy with the Anaconda exercises," he added. It was not immediately clear why the civilian car crashed into the truck while travelling on the A-18 motorway near the town of Swietoszow. Police were investigating the causes.