All major roads do this too. If the transition from a straight line to moving on a circular path happened instantly, then drivers would have to instantly turn t

All major roads do this too. If the transition from a straight line to moving on a circular path happened instantly, then drivers would have to instantly turn their steering wheels to the correct angle for the turn. Very very occasionally i'll encounter a turn with that discontinuity and it feels really unsafe and jarring. I wouldn't be surprised if some residential roads were intentionally designed this way to help limit speed.