SBS Transit inspectors on motorbikes can summon the Certis Cisco
motorbike?? 
Yes, but the SBS transit inspector need to stop and park the
bike to summon the certis Cisco motorbike so in turn the Certis
Cisco motorbike can also summon the SBS Transit Inspector.
As they are summoning each other, the SembCorp wardens can
summon both of them, and each party can summon one another.
As that is happening, Traffic Police stops to summon all of
them. Slowly there is too many motorbikes parked in the Bus Bay,
then the bus is unable to move and create a traffic jam, then
traffic slows.
That's when LTA steps in and decided that the road needs an ERP
to keep it smooth flowing.