To give you right of way
							                                
                                        
                                    
							                        
                    
                            To attract a friend's attention
							                                
                                        
                                    
							                        
                    
                            To warn others of your presence
							                                
                                        
                                    
							                        
                    
                            To make slower drivers move over
							                                
                                        
                                    
							                        
                     
	 
	