The phrase "transportation sector" is correct and is commonly used in written English.
Example: The transportation sector is an integral part of the economy.
The transportation sector in China is skyrocketing.
Orders in the transportation sector fell 10.2 percent in July.
Excluding the volatile transportation sector, orders rose 2.6 percent.
Excluding the volatile transportation sector, orders dropped 3.8 percent.
That is not even counting the transportation sector.
Mozambique's transportation sector reflects the country's historical development in relation to its neighbours.
But outside of the volatile transportation sector, orders rose for the first time since March.
Excluding the volatile transportation sector, orders rose 0.4 percent, after gaining 1.3 percent in August.
Excluding the volatile transportation sector, orders gained 3.1 percent, the largest increase since August 2005.
Natural gas can also play other roles in the transportation sector.
Orders dropped 3.8 percent when the volatile transportation sector was excluded.
