Abstract: Vehicle speed values are preliminarily stored in an apparatus including a pulse generator 2 coupled to a speed sensor 1, a microprocessor 4 and an electronic memory 14, and a visual speed reconstruction is provided by reading out data from the memory 14 to an external recording instrument 32. The pulses generated with separations corresponding to a given road length act as interrupt signals for a counting operation performed in the microprocessor 4 so that the count or a speed value derived therefrom is transferred for each interrupt signal to the memory 14. The memory has a number of series-arranged memory blocks 15-18 having cyclically addressed memory locations arranged as circular lists and divided into sections having an equal number of memory locations, with a marking of the first memory location in each section.