- http://www.thebattens.me.uk/euro1.jpg
Definitely a bridge structurally - Kentish Way is only a 4-lane road after all.
I'm not familiar with the area but on Google satellite view the other (west) end of Bromley South seems more tunnel-like. It goes under the station forecourt, the three lanes of High Street and some shops. It seems a plausible guess that this is the ex-A21 and is what MotCO was intending to refer to.
(Cue the usual discussion about definitions of "tunnel".)
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