This investigation was carried out to find out the following :
1. Do the drivers allways watch their speedmeters effectively ?
2. Their speed sensibility on driving cars can be reliable without speedmeters ?

About 100 cab-drivers participated in this porgram. And the 1300 cc car was prepared in this test.
The experiment was repeated on the paved road 8.2 km long.

Test drivers are orderd by the tester to run at speed of 30km / h, 50 km / h, 60km/h and so on. Then, the drivers are requested to accomodate their speeds without looking at speedmeters. In the second test, the tester askes, "How fast are we driving now ?"
The drivers have to answer their speed feeling without the aid of speedmeters.

After the experiment, we arrived at following conclusions :
Since there are few drivers who have their correct speed sensibility, drivers should watch their own speedmeter as often as possible.

The relationship between results of the road test and the drivers' personality, and moreover, the correlation of the apptitude test by the safety driving apparatus, should be clarified in further investigations.