Some traffic junction were newly built for safety reason(reduce
accidents) while some was for convenience for people going to
Mkts/Schs nearby.
So U expect LTA to build an overhead bridge over a FOUR lanes(2
lanes for each diection) road??? 
yah, right, no such example hor.... oh..... u know what....
henderson road.... under the bridge linking mount faber and telok
blangah hill, there is another overhead bridge
holland avenue, junction with holland drive, there is also one
overhead bridge for 4 lane road.... i think on tiong bahru road,
between redhill MRT and tiong bahru MRT also have one...