| Rank | Country | Roadways |
133 | Mauritania | total: 11,066 km paved: 2,966 km unpaved: 8,100 km (2006) |
173 | Mauritius | total: 2,066 km paved: 2,066 km (includes 75 km of expressways) (2009) |
| Mayotte | void |
17 | Mexico | total: 366,095 km paved: 132,289 km (includes 6,279 km of expressways) unpaved: 233,806 km (2008) |
207 | Micronesia, Federated States of | total: 240 km paved: 42 km unpaved: 198 km (2000) |
137 | Moldova | total: 9,343 km paved: 8,810 km unpaved: 533 km (2008) |
217 | Monaco | total: 77 km paved: 77 km (2008) |
81 | Mongolia | total: 49,249 km paved: 3,015 km unpaved: 46,234 km (2010) |
145 | Montenegro | total: 7,624 km paved: 5,097 km unpaved: 2,527 km (2010) |
| Montserrat | note: volcanic eruptions that began in 1995 destroyed most of the 227 km road system; a new road infrastructure has been built on the north end of the island (2008) |
76 | Morocco | total: 58,256 km paved: 39,480 km (includes 866 km of expressways) unpaved: 18,776 km (2008) |