The multiple-vehicle collision occurred at TEM highway near Silivri district in the morning. One man died at the scene.
Some Turkish Airlines flights from Istanbul, Izmir and Ankara to Rome, Barcelona and Bucharest plus fast ferry services from Yenikapi district in Istanbul to the western province of Bursa province were cancelled.
Storms also uprooted trees and damaged roofs.
Heavy snowfall closed schools in Istanbul, Ankara and some districts in western Izmir.
In the western province of Manisa and central Kutahya, intercity bus services have been halted. In central Kirikkale province, 28 towns have been closed to traffic due to snowfall.
Snow depth reached 110 centimeters in western Kartepe, and 170 centimeters in Uludag – one of the country’s important winter tourism centers.
In southern Mersin province, storms damaged greenhouses and some ferry services were cancelled. In the western province of Izmir, many buildings and workplaces were damaged due to storms.
The snowfall is expected to slow down across the country on Thursday. However, the cold weather will continue until the end of the week, the State Meteorological Service has announced.