The Trans-Afghanistan Pipeline (TAP) is a proposed natural gas pipeline, being developed by the Asian Development Bank. The pipeline will transport natural gas, from the Caspian Sea, through Afghanistan, to Pakistan and the Indian Ocean. The Afghani government is expected to receive 8% of the project's revenue. TAP will be constructed alongside the highway running from Herat to Kandahar. The cost of this international infrastructure is estimated at US$3 billion. Proponents of the project see it as a modern continuation of the "Silk Road".

See also: Trans-Alaska Pipeline System (TAPS)