These are called Chainage. Used to measure distance from the start of a project. At first beginning it'll be 0+000. 1st digit is KM and 2nd is M. So 6+200 is 6KM and 200M from the first pegging.
Lord, make me an instrument of your peace.
Where there is hatred, let me sow love;
where there is injury, pardon;
where there is doubt, faith;
where there is despair, hope;
where there is darkness, light;
and where there is sadness, joy. - St Francis of Assisi.