Are you splitting the lanes when the traffic is backed up?

Admittedly most trekking Bars Are a bit wide.. my 2 ITM bars measure ... the Freetime is 51` to the tube center (about), the adjustable one is 56.

FWIW, Ergon GR3 on my Brompton are about 52 using a similar center of the bar end measurement.

if you can score a set of Modolo's 'Dumbo' trekking bars, they are even more adjustable including width..