Hizo ni route tu za barabara, kila nchi huwa ina hizo route
Hizo B6, T15, A2, etc ni route za barabara, kila nchi huwa ina hizo route zake, mfano kwa Tanzania T humaanisha barabara kubwa, mfano T1 ni hii Morogoro Road kuanzia Dar - Moro-Iringa-Mbeya, T2 Chalinze - Arusha, T3 Morogoro - Dodoma-Singida, etc na R1 hizo ni regional Roads,
Hio ni kwa ufahamu wangu, watalaam zaidi wanaweza kuongezea au kukosoa ama kurekebisha.
Most of the trunk roads in Tanzania are marked by numbers following the two-tier number system with prefixes A- and B-, as is practiced in the rest of East Africa
A7 492 Km Dar es Salaam - Iringa, Chalinze - Morogoro - Mikumi
A14 315 Km Chalinze - Horohoro via Segera - Tanga
A19 620 Km Masasi - Mbamba Bay via Tunduru - Songea - Mbinga
A23 117 Km Arusha - Holili Moshi
A104 1218Km Tunduma- Namanga via Mbeya - Iringa - Dodoma - Kondoa - Arusha
B1 263 Km Segera - Himo
B2 561 Km Dar es Salaam - Mtwara via Kilwa - Lindi
B3 625 Km Singida - Rusumo Falls via Nzega - Isaka - Kahama
B4 293 Km Makambako - Songea via Njombe
B5 120 Km Mingoyo - Masasi
B6 1071 Km Makogolosi - Sirari via Rungwa - Tabora - Shinyanga - Mwanza
B8 1128 Km Kasesha - Mutukula via Sumbawanga - Mpanda - Kasulu - Biharamulo - Bukoba
B129 388 Km Morogoro - Manyoni via Dodoma
B141 308 Km Rungwa - SIngida via Itigi - Manyoni
B143 151 Km Singida - Babati
B144 390 Km Makuyuni - Kukirango via Karatu - Ngorongoro - Serengeti National Park
B163 230 Km Usagara - Biharamulo via Sengerema - Geita
B182 171 Km Nyakasanza - Kyaka via Kimisi - Burigi Game Reserve - Omurushaka
B182W 111 Km Omurushaka - Murongo