Road V mtb for commutte

I currently commutte to work by road bike 6.5 miles each way. Love the extra fitness its given me.
However come the darker nights, I feel more vunerable on some of busy junctions. There is an alternate route - but this is best done on an MTB.
Would this help or hinder my fitness ? On the one hand you need to put more effort in on the MTB - on the other hand - its so sole detroying, that I just plod - I am 10 minutes slower on an MTB ?
However come the darker nights, I feel more vunerable on some of busy junctions. There is an alternate route - but this is best done on an MTB.
Would this help or hinder my fitness ? On the one hand you need to put more effort in on the MTB - on the other hand - its so sole detroying, that I just plod - I am 10 minutes slower on an MTB ?
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IMO ride the heavy old MTB for the commute and it should make you go faster when you get back on your road bike.
it's a hard life if you don't weaken.