According to your interpretation of Section 35, trucks and passenger vehicles must also drive in the outermost left-hand side lane.
Section 35 relates to slow moving motor vehicles of all types.
Section 34 gives exceptions to that rule when:
a. there is obstruction on the road
b. the road is prescribed as one-way
c. it is necessary to enter the correct lane upon approaching a junction
d. when overtaking another vehicle
e. when driving faster than vehicles in the left-hand side lane.
It appears that c, d or e could apply in this case.