The phrase "additional tunnel" is correct and usable in written English.
It can be used when referring to an extra or supplementary tunnel in various contexts, such as construction, transportation, or infrastructure projects.
Example: "The engineers proposed the construction of an additional tunnel to improve traffic flow in the area."
Alternatives: "extra tunnel" or "supplementary tunnel".
When the packets with the additional tunnel header were delivered through a wireless link between the MAG and mMAG, the additional tunneling overhead decreased the UDP throughput.
They'll be backed by an additional "tunnel" doctor, using TV replays to judge the severity of incidents.
New Jersey Transit's executive director, George D. Warrington, said an additional tunnel -- with an inbound and an outbound tube -- would in effect double the number of trains operating between New Jersey and Pennsylvania Station in Manhattan during peak hours.
The MAG then sends packets to the MNN via the mMAG without any additional tunnel header.
Once the packets arrive at MAG1, they are routed to MN1 via the mMAG without any additional tunnel header.
A third molecule with an additional tunnel barrier in the central axis shows a strongly suppressed conductance.
If it wins Congressional approval, the Energy Department will construct a honeycomb of 35 miles of additional tunnels to house the waste.
As the demand for roads and railways increases, additional tunnels are needed because of the mountainous topography of Korea.
The Campaign to Protect Rural England said additional tunnelling would be "essential" if HS2 is to be built through the Chilterns and welcomed the possibility of additional funding.
Its spatial analogue is more challenging as it requires that the additional tunnelling coupling between sites one and three is imaginary (see the definition of (K_{3}) in Eq. (7)).
"We have to be cautious, we're proceeding in looking for additional tunnels... [and there are] probably more tunnels that we need to expose".
