trafficability
noun
                                                                                                                            
                                                            traf·fic·abil·i·ty
                    
                                                                                                              
                                                                                                                                  ˌtra-fi-kə-ˈbi-lə-tē  
                                                      
                                                          
            
                                
              
          
                                                      : the quality of a terrain that permits passage (as of vehicles and troops)                                      
                
                    
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  Merriam-Webster unabridged




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