It's now obvious that the photographer screwed up his f-stop settings and the original main subject image, the vehicle, was underexposed due to back-lighting. He should have known better if a pro and opened up a couple stops OR used his EV compensation dial. But he didn't so it was done in the lab, washing out the blue. (its still funny hough, French & 'White' Flag)
A first year Photo student knows about the evils of back-lighting and light meter readings
Or he may have had it properly exposed on a digital camera. Digital cameras' maximum value is much more defined than film. If the light blue (RGB = 133, 151, 193) got twice as much light as it should it would be RGB = 266, 302, 386. However, the pixels are limited to 255 so you get RGB = 255, 255, 255 or pure white. Film doesn't have such a sharp maximum, so it will still bluish.
Generally on digital cameras I underexpose the picture slightly because I can later brighten the picture to get it to look good. If it is overexposed then colors can be lost which cannot then be recovered by darkening the picture.