Lyric discussion by diki102064 

Cover art for 303 lyrics by Kula Shaker

303 that Mills' meant is OM (Aumkara) or Supreme Being which most of us said as GOD. OM sacred Sanskrit letter in Hinduism could be read as 3 0 with little "3" clockwise rotated above the "0" figure. https://en.wikipedia.org/wiki/Om

@diki102064 What makes you think that's what he means? 30 isn't 303. By your logic, 303 = OMO, not OM. Also, there are lot of lyrics that suggest driving (driving down the road, hands on the wheel, Mercedes Benz, so the A303 is a more logical explanation but I suppose there's a chance it's all just a metaphor.