As a guide for stopping distances
							                                
                                        
                                    
							                        
                    
                            To maintain a safe and correct position on the road
							                                
                                        
                                    
							                        
                    
                            To judge the speed of other vehicles
							                                
                                        
                                    
							                        
                    
                            As markers to overtake
							                                
                                        
                                    
							                        
                     
	 
	