can the adxl 345 measure speed?

i want to put my arduino into my car and measure the speed using the adxl, however all the videos ive seen are people measuring angles so im wondering if it was designed to be able to measure speed in kmph for example or not. If not is there another way to measure the speed?

An accelerometer measures acceleration, not velocity.
By integration, you may get an approximation to velocity, but it will not be a very useful value.
GPS will give a better value.