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The materials required for the experiment:

-    A back lane or narrow corridor measuring 40 meters long
-    10 licensed drivers with at least 3 years driving experience
-    1 car fitted with 1 rear fog light
-    1 car fitted with 2 rear fog lights
-    1 car without any rear fog lights
-    1 car to be driven by the participants
-    2 fog machines
-    A long measuring tape (at least 15 meters in length)
-    An assistant


1.    For this experiment, the independent variable is the number of fog lights on the car. The dependent variable is the distance between the cars. The distance is measured using a measuring tape. The constants (control variables) are the amount of fog created by the 2 fog machines, the make and model of the cars used for the experiment and the driving experience of the participants.

2.    Ten drivers with 3 years minimum driving experience are selected. Very that they have good eyesight for the purposes of the experiment.

3.    On the day of the experiment, the 10 participants are brought to the testing area (a 40 meter long and straight back lane).

4.     The car without the fog light is parked at one end of the back lane so that the rear lights of the car are visible from the other end of the same lane. The car lights are turned on so that the drivers can see the red rear lights.

5.    The fog machines are switched until the entire 40 meter length of the back lane is covered with fog.

6.    The 10 drivers are asked, one at a time, to drive the second car . They are asked to stop approximately 10 meters away from the car parked in front. The distance from the front of the driven car to the rear of the stationary car is recorded in the table given below.

7.    Procedure 6 is repeated with the car that has 1 rear fog light and the car with 2 rear fog lights and all the data is recorded in the table below.

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Complexity level:
Project cost ($):
Time required:
1 hour to prepare, 1 day for experiment
Material availability:
4 cars, 3 of which are of a similar make and model are required. Fog machines will need to be leased for the purposes of this experiment
Safety concerns:

Be careful to avoid any accidents. Always have someone on standby to alert the drivers, to prevent them from colliding into the stationery cars