FOREIGNER: WHY DO S’PORE DRIVERS NOT GIVE WAY TO AMBULANCES?

What is the law in SG in regards to emergency vehicles such as fire engines and ambulances? I have been here 3 years and I constantly witness drivers not giving way to emergency vehicles such as this one.

This occurred on Bukit Timah Road near 6th Avenue. Drivers refused to pull over and give way and this ambulance struggled to get through the congestion. Lights were blinking for 3 kilometers yet no one gave way.

What if your son or daughter were in that ambulance???