The road runs from the center of Morogoro where the Trunk Road T1 and T3 intersect all the way to Rwandan border at Rusumo.

[1] The trunk road forms the only major land link to East African Community member Rwanda.

In 2022 the New Wami Bridge was opened after the Tanzanian government spent TZS 75 Billion to upgrade the bridge and increase safety.

[3] Between the 42 km (26 mi) streach from Nzega to Tinde, the T3 trunk road shares its designation with T8 trunk road.

Between the 15 km (9.3 mi) streach from Nyakanazi to Lusahunga, the T3 trunk road shares its designation with the T9 trunk road.