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I have just noticed that headlight beams are tested in the US. Whilst the Yaris has not been tested for headlights, the new CH-R has and it also uses the HIR2 bulbs. Check out the details here: https://www.iihs.org/iihs/ratings/vehicle/v/toyota/c-hr-4-door-suv Low beams On the straightaway, visibility was good on both sides of the road. On curves, visibility was inadequate in all 4 tests. The low beams created excessive glare. High beams On the straightaway, visibility was inadequate on both sides of the road. On curves, visibility was inadequate in all 4 tests.

As the 4wd is achieved via a small electric motor in the rear axle rather than lots of extra shafts and differentials, I doubt it makes as much difference as cars with mechanical 4WD. If the rear electric motor also contributes to regenerative braking (I've not seen any info on that so far) it may even be slightly better.

I've found a way to greatly improve the Yaris Hybrid H1R2 headlights - fit modified HB4 headlight bulbs! Basically HB4 and H1R2 only differ in having slightly different plastic lugs for mounting. More importantly, for some reason, there are +110%, +130% etc versions of HB4 whereas there aren't for H1R2. Therefore with only a small modification to a lug, you can safely fit an HB4 such as this: https://www.amazon.co.uk/OSRAM-NIGHT-BREAKER-UNLIMITED-Headlight/dp/B00FQ8ANTE/ref=cm_cr_arp_d_product_top?ie=UTF8 This is a Nightbreaker +110%; the reason I include this link is that it includes details of the modification - look for the "top customer review" regarding their use on the Vauxhall Ampera, which suffers from similarly rubbish H1R2 lights. Now my Ampera and my wife's Yaris Hybrid have far better lights, use the Halfords +130% HB4 bulbs which are always on buy one, get one free :) Hope this helps... Richard