Trans-African Highway (TAH 4), Cairo–Gaborone–(Pretoria/Cape Town) Highway, 10,228 km: the completion of the stretch of highway from Dongola to Wadi Halfa in Northern Sudan and the road from the Galabat border crossing in North-Western Ethiopia leaves only 2 stretches unpaved: between Isiolo and Moyale in northern Kenya (dubbed 'the road to hell' by overland travellers) and the gravel section through Dodoma in central Tanzania.