Primary General Studies | Hong Kong public transport and road safety guide | Five modes, three looks and four common errors

2026-11-14

Tutor lesson-prep guides · Primary General Studies

The most dangerous sentence from a P2 student is that a green man means it is safe. A green man means vehicles should stop, but you still look, and because Hong Kong traffic keeps left the first vehicle to reach you comes from the right, so the first look is always to the right. The other common error treats speed and safety as the same question: double the speed and the braking distance becomes four times longer, not twice. This lesson turns road safety into three actions students can perform rather than the words be careful.

Objectives — Students can (1) name the five public transport modes in Hong Kong and give one trip each suits; (2) state the crossing order of right, left, right and explain that a flashing green man means do not start; (3) explain that doubling speed makes braking distance four times longer and calculate that 60 km/h covers about 16.7 metres each second.

01 Prerequisites (3-minute check)

If any of these fails, fix it before the lesson starts.

Skill	Quick check	Pass mark
Hong Kong traffic keeps left and the driver sits on the right	Standing at the kerb, which side does the nearest car come from?	The right, so look right first
An hour has 60 minutes and 3,600 seconds	How many metres is 60 kilometres?	60,000 metres
Multiplication and the idea of a multiple	What is 2 squared?	4, that is 2 times 2

02 Lesson flow (45 minutes)

Time	Stage	Tutor does	Student does
0-5 min	Opening judgement	Ask whether a green man means it is safe and hold the answers for the end	Most will say yes; do not correct yet
5-14 min	Five modes	Write one suitable trip for each and compare speed, cost, frequency and reach	Never call any mode the best one
14-24 min	Three looks	Rehearse on a mat or in the corridor: right, left, right, then walk straight	A wrong order means doing it again, not explaining it
24-34 min	Speed and distance	Calculate 60 km/h as 16.7 metres per second, then double speed gives four times the braking distance	Use one real road as the example; bare numbers do not stick
34-40 min	Flashing green man and blind spots	Of a 20-second green man the last 8 seconds mean do not start; never wait in front of or behind a bus	Students must say do not start, not run faster
40-45 min	Exit check	Three spoken items and one written item	See section eight

03 Teaching script (read it out)

Scene 1: Five modes, one job each

Do not open with safety. First make sure students can tell the tools apart. The MTR runs on fixed tracks with frequent trains and no road congestion, so it suits long cross-district trips. Buses have the widest route network and reach housing estates, but sit in traffic. Trams are the slowest and cheapest and run only along northern Hong Kong Island. Ferries cross the harbour without traffic but run less often. Minibuses and light rail feed short trips inside residential districts. Give every mode the same sentence frame: I want to go from here to there, so I take this one because. Then ask each student to describe their own route to school and say why they do not use another mode. Concrete routes make the safety work later meaningful.

Close by asking what they would do if the MTR stopped running tomorrow morning.

Scene 2: Crossing: three looks and one rule about not starting

Act two is done with the body, not with notes. Hong Kong traffic keeps left, so the lane nearest the kerb comes from the right and the order is fixed: right, left, right, then walk straight without running. Pair the looks with listening; an engine you can hear but cannot see means wait. Then settle the green man. A pedestrian green man lasts about 20 seconds and flashes for the last 8 seconds, and flashing means do not start, not hurry. If the road is 12 metres wide and a student walks 1 metre per second, crossing takes 12 seconds, exactly the time left when flashing begins, so anyone who starts on the flash is still on the road when vehicles get their green. Finish with blind spots: in front of a bus, behind a bus, and along the right side of a lorry are places the driver cannot see, so never wait there.

Close by asking for the three-look order; a wrong order means repeating it once.

Scene 3: Speed and braking: double gives four times

Act three replaces the vague feeling that slower is safer with one calculation. At 60 km/h a vehicle covers 60,000 metres divided by 3,600 seconds, about 16.7 metres every second, so one second of reaction time already costs 16.7 metres; at 30 km/h it is 8.3 metres. Braking distance grows with the square of speed, so going from 30 to 60 makes it four times longer, not twice. Write both numbers side by side: a classroom is about 8 metres long, so 16.7 metres is two classrooms. Then use the bus: one bus is 12 metres, five buses in a row are 60 metres, and that is how far a vehicle at 60 km/h travels in one second. Once students compute this, the question of why not just go fast disappears.

Close by asking what halving the speed does to braking distance: a quarter.

04 Question types and worked steps

Type	Example	Steps	Answer
Matching	Match the MTR, bus, tram, ferry and minibus each to one suitable trip	Name the trip length, then whether a harbour crossing is needed, then the mode	A mode with no reason scores nothing
Procedure	Write the three-look order and state what to do when the green man flashes	Right, left, right, then do not start on the flash	A wrong order is wrong; guessing left and right does not count
Calculation	How far does a vehicle at 60 km/h travel each second? At 30 km/h?	Divide 60,000 by 3,600, then 30,000 by 3,600, and give units	Answers 16.7 and 8.3; no units loses a mark
Explanation	Why does doubling speed make braking distance four times longer?	Mention the square of speed, then the reaction distance, then one concrete example	The words four times or squared must appear

Sanity check (teach this): Sanity check: three spines hold the chapter, recognising the modes, crossing with three looks and the flashing rule, and computing distance, and each carries one action or calculation a P2 student can do. Number plates, penalties and insurance are deliberately left out because P2 needs what to do, not what the law says. The green man is described as about 20 seconds with the last 8 flashing, which is observable, rather than quoting regulations. The 12-metre road and 1 metre per second are classroom examples that students multiply themselves, so nobody assumes every road is the same width. The fourfold relation is given as a result only, with no formula, because P2 has not met powers.

05 Independent practice (3 questions)

Question	Answer	What to watch
Three looks	Write the order and mark on the diagram which way the first look goes	Must be right, left, right
Calculation	How far per second at 60 km/h and at 30 km/h, and what is the ratio?	16.7 m, 8.3 m, a factor of 2
Explanation	A classmate says a green man is always safe: give two sentences on what is missing	Must mention the three looks or the flashing rule

06 Common mistakes and what to say

Mistake	Student writes	Say this
Believing a green man is always safe	A green man means no cars, so just walk	A green man means cars should stop, not that none will run the light. You still look right, left, right, and start only when the cars have stopped.
Looking left first	Look left first because cars come from the left	Hong Kong traffic keeps left, so standing at the kerb the nearest car comes from your right, and the first look is always to the right.
Thinking braking distance only doubles	Double the speed and the stopping distance doubles	Braking distance follows the square of speed: from 30 to 60 the distance is four times longer, not twice.
Waiting in front of or behind a bus	Standing in front of a stopped bus is the safest place	In front of and behind a bus are blind spots. Once the bus pulls away the driver cannot see you, so walk to a proper crossing.

07 Homework (paper, section and question numbers)

Independent practice in this chapter, with answers — Use practice items 1 to 3, plus two written items: describe the route to school with a mode and a reason, and compute metres per second at 40 km/h
Primary General Studies paper for mixed practice — For revision week mixed practice; the paper has no road safety items, so treat it as question-reading and answer-format training

08 Exit check (last 5 minutes)

Question	Answer	Decision
State the three-look order	Right, left, right, then walk straight	A wrong order means repeating the drill
What do you do when the green man flashes	Do not start; wait for the next green man	Run faster means the rule was missed
What happens to braking distance if speed doubles	It becomes four times longer	The 30 and 60 example must come with it

09 Tutor FAQ

Why look right before left?

Because Hong Kong traffic keeps left. Standing at the kerb the nearest lane comes from your right, so looking left first leaves the most immediate danger to the end. Give the traffic-direction reason rather than calling it a habit.

Is squared too advanced for P2?

Do not use the word. Give the result only: going from 30 to 60 turns one unit of braking distance into four, shown with two strips of paper side by side. The vocabulary belongs to secondary school; the relation belongs here.

What if a student asks why buses cannot simply all drive slower?

A good question that leads back to journey time: half the speed roughly doubles the time on long routes and thins out the service. Safety and time are two sides to balance, not one direction called slower is better.

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A TutorZone lesson-prep guide. Written by the TutorZone team; questions and lesson flow are original and are not taken from any school or publisher material.