as is safe and practical

[WilliamTaft]

Bicyclists must ride with the flow of traffic and as near to the right side of the road or street as is safe and practical.
Source: Utah Driver Handbook 2022-2023

What is the subject of "is?"

 

[Tarheel]

I don't think it has a subject. Instead, it's part of a phrase.

 

[jutfrank]

I'm not sure about the grammar but the logical subject is 'a point near to the right side of the road'.