The phrase "a key junction" is correct and usable in written English.
It can be used to describe an important point of intersection or decision-making in various contexts, such as transportation, strategy, or life choices.
Example: "The project reached a key junction where the team had to decide between two different approaches."
Alternatives: "a crucial intersection" or "a critical crossroads."
Byrne's strategists said internal "sentiment trackers" revealed that a key junction in the campaign was a Q&A both candidates conducted with the Guardian, published last week.
The most disturbing events of the weekend occurred at Nasiriya, where American forces engaged in a fierce firefight -- an early glimpse of urban warfare -- with Iraqi soldiers at a key junction on the Euphrates River.
Regarded as the gateway to the Sahara, Sabha is also a key junction for routes to Algeria, Niger and Chad that could be used by senior regime officials looking to escape the country, according to rebels.
A United Nations spokeswoman, Hirut Befecadu, said Indian, Jordanian and Nigerian peacekeepers, backed by air support, had struck the group's base at Okra Hills, situated just before Masiaka, a key junction town about 50 miles from Freetown.
Now nearly 40 years later, in this dual-format DVD and Blu-ray version, we can observe Hockney handling emotional and painterly problems at a key junction in his career and admire the way Hazan has captured the hedonistic gay culture of 1970s.
Altogether, this study indicates that RAS is located at a key junction of early ESC differentiation controlling key processes in priming of naive cells.
As with the youth-oriented programming, viewers will be able to choose from a couple of alternate storyline options at key junction points in the show, changing the plot considerable.
There has been heavy fighting around Debaltseve, site of a key railroad junction, for the past week, with rebels trying to surround government forces.
Nineteen Ukrainian soldiers were killed on Wednesday defending Debaltseve, a key railroad junction town that has been in contention as both sides tried to cement their control before talks started.
When the modern states of Syria and Israel gained their independence from France and Britain respectively after the Second World War, Quneitra gained a new strategic significance as a key road junction some 15 miles (24 km) from the border.
In World War II this key junction was bitterly contested and changed hands several times, with very heavy destruction.
