Last year, 100 drivers and passengers drowned in canals before help arrived. Now, free lessons are given in how to escape from a sunken car.

Along with all the other problems that beset the motorist the world over, drivers in Holland have one added hazard to contend with: the canals. An average of two cars a day slip their brakes, back into or otherwise plunge into the country’s famed waterways. Last year, 100 drivers and…