Cryptic crossword clue
Gary is in slow car moving around transport intersection 7,8

The most common and most likely answer to this crossword clue is the 7 plus 8 letter word RAILWAY CROSSING

I've seen this crossword clue in The Daily Telegraph
R
A
I
L
W
A
Y
C
R
O
S
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I
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G

Buddy explains!

The straight part
We know that "transport intersection" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case transport intersection = railway crossing.
The cryptic/wordplay part
In cryptic crossword there's often an wordplay/cryptic part as well.
This part involves a more complex hint, such as an anagram, homophone, hidden word, etc.
Sadly, We don't have an explanation for this specific crossword clue yet.

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