Improve a driver's ability to identify hazards and conditions in the driving environment and even act as a warning to fellow drivers in certain situations.
a. turn signals
b. headlights
c. hazard lights
d. all of the above

The answer to this question is the letter "D" which is "All of the above".  The turn signals, hazards lights and the headlights used to improve a driver's ability to identify hazards and conditions in the driving environment and even act as a warning to fellow drivers in certain situations. Because of these things, the road accidents and vehicle-related incidents are reduced.

Sheet stain on pee wee's sheets

Complementary goods. they go together, thats why one price increase and the others demand increases