Tyre pressures
							                                
                                        
                                    
							                        
                    
                            Engine performance
							                                
                                        
                                    
							                        
                    
                            Overhead gantries
							                                
                                        
                                    
							                        
                    
                            Road surfaces
							                                
                                        
                                    
							                        
                     
	 
	