(a) When two vehicles approach or enter an intersection at approximately the same time, the driver of the vehicle on the left shall yield the right of way to the vehicle on the right, except as otherwise hereinafter provided. The driver of any vehicle traveling at an unlawful speed shall forfeit any right of way which he might otherwise have hereunder.

(b) The driver of a vehicle approaching but not having entered an intersection, shall yield the right of way to a vehicle within such intersection or turning therein to the left across the line of travel of such first-mentioned vehicle, provided the driver of the vehicle turning left has given a plainly visible signal of intention to turn as required in this Act.

(c) The driver of any vehicle upon a highway within a business or residential district shall yield the right of way to a pedestrian crossing such highway within a crosswalk, except at intersections where the movement of traffic is being regulated by a peace officer or by traffic signal. Every pedestrian crossing a highway within a business or residential district, at any point other than a crosswalk shall yield the right of way to vehicles upon the highway.

(d) The driver of a vehicle upon a highway shall bring to a full stop such vehicle before traversing any "through highway" or railroad crossing: Provided, That when it is apparent that no hazard exists, the vehicle may be slowed down to five miles per hour instead of bringing it to a full stop.