AUTO ACCIDENTS The aeroplane wins the booby prize. One person out of every 24,451 who ride in aeroplanes is killed; one in every 5,973,436 in costwise, lake, river and steamship vessels; one in 6,313,800 on steam railways; and one in every 8,422,460 on electric railways. Number killed in motor car accidents hasn't been figured out, but accidents in autos in the U. S. have risen from 2.2 per cent per 100,000 people involved to 15.7 per cent since 1911, while those on street cars have fallen from 3.2 per cent to 1.6 per cent.