| Value | Category | 
                                    
                    
                        | 1 | Minibus | 
                                    
                    
                        | 2 | Bus | 
                                    
                    
                        | 3 | Car | 
                                    
                    
                        | 4 | Truck | 
                                    
                    
                        | 5 | Taxi | 
                                    
                    
                        | 6 | Bicycle | 
                                    
                    
                        | 7 | Tractor | 
                                    
                    
                        | 8 | Horse | 
                                    
                    
                        | 9 | Walking | 
                                    
                    
                        | Sysmiss |  | 
                            
            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.