DOHA — Oman said it would keep the Strait of Hormuz open to shipping without imposing any tolls and had designated two temporary routes north and south of the existing shipping lane to facilitate the safe passage of vessels departing the region.

In coordination with the International Maritime Organization, Oman established temporary maritime corridors to help ships leave the area safely amid heightened security risks. The Strait of Hormuz, a vital route for roughly a fifth of global oil and liquefied natural gas supplies before the war, has been heavily disrupted since the United States and Israel launched a war against Iran on February 28, curbing commercial shipping and rattling global energy markets.

In a notice to mariners, Oman said the existing Traffic Separation Scheme in the strategic waterway was currently unsafe for use and that vessels departing through the strait could instead use temporary routes located to the north and south of the existing shipping lanes. The scheme, adopted by the United Nations’ shipping agency in 1968, established routing lanes through Iranian and Omani waters in the strait.

The Gulf Arab state said the measures reflected its responsibilities towards the strait, its importance to the global economy and its commitment to international law and freedom of navigation, citing understandings reached between the United States and Iran. Oman said navigational safety remained the overriding priority and that a gradual, controlled movement of vessel traffic was required because of an elevated risk of collisions.

Under a phased plan developed by the IMO in coordination with Omani authorities, vessels will be grouped and contacted individually with instructions on when they may depart and which route they should follow. Ships will be directed to a designated waiting area in international waters before being cleared to proceed. Vessels using Oman's eastbound route will be required to maintain communications with coastal authorities and comply with all navigational instructions.