************/
function reset() {
  ghRouting.clearPoints();
  startMarker.remove();
  endMarker.remove();
  start_set = 'N';
  end_set = 'N';
  document.getElementById("instr").innerHTML=emptyInstruction;
  var mapLayer = map.getLayer('route');
  if (typeof mapLayer !== 'undefined') {
    map.removeLayer('route').removeSource('route');
  }
} // reset
/***************************************************
* Create <img> tag for sprite with a given name
***************************************************/
funct