Where on a street you want people to drive slowly because there's lots of driveways or businesses and therefore people pulling on and off, a road wants people to drive fast because it's purely for movement from one area to another eg a highway.
A stroad is when they try to do both at once and get the worst of both worlds. Can't drive fast because you're constantly stopping and starting, but you're still driving too fast for people to safely go in and out of traffic.
Where on a street you want people to drive slowly because there's lots of driveways or businesses and therefore people pulling on and off, a road wants people to drive fast because it's purely for movement from one area to another eg a highway.
A stroad is when they try to do both at once and get the worst of both worlds. Can't drive fast because you're constantly stopping and starting, but you're still driving too fast for people to safely go in and out of traffic.