1.5 times of the indicated speed limit?
The posted speed limit means speed is limited on that road or
express way.
Therefore 60 kmph means not more than 60 kmph, but less.
Same for 90 kmph.
So if you drive at 91 kmph you have actually exceeded the speed
limit for our express ways, and have committed a traffic
offence.
Your point is that among those who exceed the speed limit, the one
that have exceeded the most should not be impeded by the lesser
one. In other words, give way to the greater offender!
On another point:
Of late, my observation is that there is an increasing numbers of
incidents of cars entering the highway slowly from slip roads
thereby causing those vehicles travelling on the extreme left lane
to brake.
Those entering the highway should
(1) give way to those on a major road,
(2) give way to traffic approaching from the left,
(3) obey the give way sign.
These few drivers ignore all these and cut into highway traffic at
50-60 kmph. Forcing vehicles on the extreme left lane to brake to
avoid a rear end colision with the entering car.
Motorcyclists cut in and zoom off, sports cars cut in and zoom
off.
But these saloon cars cut in, as long as they have the space to do
so, and is oblivous to the fact that they are impeding traffic that
is going at 70-80 kmph.
They should learn to speed up along the shoulder within the dotted
line and merge with the traffic, or simply give way and stop. Enter
the highway when traffic from the left is clear.
