We already had a term for that, a four lane, and "street" and "road" are synonymous so combining them doesn't produce new meaning

The only people who use that word are insufferable choads who want me to give up my car and live in a tiny apartment because of their misguided belief that if everyone lived like they do in Manhattan global warming would end and the world would be a Utopia

"Stroad" is a shibboleth that tells me you're someone with an opinion that is not worthwhile