| Value | Category | 
                                    
                    
                        | 1 | Aircraft | 
                                    
                    
                        | 2 | Bus | 
                                    
                    
                        | 3 | Car | 
                                    
                    
                        | 4 | Motorcycle/scooter | 
                                    
                    
                        | 5 | Bicycle | 
                                    
                    
                        | 6 | Taxi | 
                                    
                    
                        | 7 | Train | 
                                    
                    
                        | 8 | Other | 
                                    
                    
                        | 9 | Unspecified | 
                            
            Warning: these figures indicate the number of cases found in the data file. They cannot be interpreted as summary statistics of the population of interest.