Does any one know what the dots on a volvo 240 speedo are there at 50kph 100 kph and 180kph?

Question

There located at 50kph 100kph and 180 kph

Answer 1

these are the max speeds allowed in lower gears 1st. 50 kph , 2nd 100kph, 3rd 180 kph. if you compare tach readings at these points with kilowatt bar graph you will note that the kph limits are right at the peak of the kiolwatt curve[ or horsepower curve if non metric]

Answer 2

The speeds translate to about 30,60,&90 MPH, which are pretty common speed limits. They are also spaced at regular intervals in the dial (if there is a dial) suggesting cosmetic reasons.