It doesn't have to look shit either. You can get it in black, so if you're thoughtful it's not hard to do pinstripes or say block rectangles on the back of the seatpost, headtube, stays, etc. On one bike I bought a cheap craft star shaped cutter and put black stars on my black wheels.
Also reflectors on the pedals are great for viability from a drivers pov as they're usually moving.
There's a reason why bikes are all meant to be sold with front and rear reflectors.
Reflective 3M tape is a good suggestion.
It doesn't have to look shit either. You can get it in black, so if you're thoughtful it's not hard to do pinstripes or say block rectangles on the back of the seatpost, headtube, stays, etc. On one bike I bought a cheap craft star shaped cutter and put black stars on my black wheels.
Also reflectors on the pedals are great for viability from a drivers pov as they're usually moving.
There's a reason why bikes are all meant to be sold with front and rear reflectors.