Bike lane should be alongside the sidewalk.

 I believe that no vehicle should be driven on the road that doesn't exceed 30 km/h or doesn't meet the lowest speed limit of a road. I mean, all kinds of bicycles should have a separate lane with a sidewalk, not with the road. If there is no separate lane, then they might run on the sidewalk, except on community roads.

Because if any conflicts happen with a car, it could be deadly for the cyclist. If the conflict happens on the sidewalk, probably everyone will survive. We don't want conflicts, but we prioritize safety for all.

Roads should be reserved for fast vehicles only, to ensure everyone's safety.

Bicycle lane

Bicycle Lane, separated from the road.

 In Canada, I have seen them always make a bicycle lane on the roadside. Cyclists are not allowed to ride on the sidewalk, no matter how wide it is. I found it very risky. The speed of the cars and bicycles doesn't match. That's why if any kind of collision happens, the cyclist dies in most cases. It's very common over here.

What if a collision happens between pedestrians and cyclists? In most cases, both will survive.

That's why a bicycle lane should be developed beside the sidewalk. There could be a divider or small gap between the two lanes. In this bicycle lane, try cycles, scooters, and some chairs that can run like cars.

Roads should be only for the 4 wheelers. Here are some examples and some beneficial ideas. Like adding solar panels to the bicycle lanes.

In Portugal, the bicycle lane is with the sidewalk.

Separated bicycle lane in Turkey

Bicycle lane with solar panel.

Solar panel shades with the bicycle lane at the divider of the roads. In South Korea

Solar panel shades with the bicycle lane at the divider of the roads. In South Korea.

Separated from the road, bicycle lane with the sidewalk but separated too, in the UK.