8.3 Thinking Distance and Stopping Distance

8.3 Thinking Distance and Stopping Distance

Legal maxima from the Second Schedule and from posted signs (sections 8.1–8.2) are only half of the speed question. The Guyana Road Traffic Code then asks whether you can stop in the space you can see. This section is independent study of the Code's thinking-distance, braking-distance, and stopping-distance tables, in both miles per hour / feet and km/h / metres.

Quick Answer: Danger distance is thinking distance plus braking distance. For a good alert driver, thinking distance is 20 feet at 20 mph, 30 ft at 30, 40 ft at 40, 50 ft at 50. Braking for private cars and light vans with perfect brakes on a good surface is 20, 45, 80, 125 feet at those speeds. Minimum stopping on a dry road: 40, 75, 120, 175 feet; on a wet road approximately double. Metric tables: thinking 6.1 / 9.1 / 12.2 / 15.2 / 18.3 m and dry stopping 12.2 / 22.9 / 36.6 / 53.4 / 73.2 m at 32 / 48 / 64 / 80 / 96 km/h. Fatigue and alcohol increase reaction time.

Danger distance

The Code tells you to read this. Danger distance is the distance between you, while driving, and the point at which you are certain the vehicle can be brought to a standstill. It depends on:

• the speed of the vehicle
• its weight
• the efficiency of its brakes
• the condition of the road surface
• the time it takes you to react to an emergency

Danger distance = Thinking Distance + Braking Distance.

The Code's slogan on the same page: KNOW THE SAFE LIMIT FOR YOUR VEHICLE AND OBSERVE IT. The Second Schedule and posted signs are legal maxima. Danger distance is why a legal speed can still be too fast for the view ahead. Rule 22 already said: never drive at a speed from which you cannot pull up well within the distance you can see to be clear, and go much more slowly if the road is wet or slippery. Always leave yourself enough room in which to stop.

Thinking distance (imperial)

Thinking distance depends on reaction time. In the time you see a hazard, decide, and move your foot to the brake, the vehicle is still travelling at the old speed.

For a good alert driver:

Memory aid: at these four speeds, thinking distance in feet matches the mph figure — only for an alert driver. Do not invent extra rows the Code does not print.

Braking distance (imperial)

The Code states braking distances for private cars and light vans with brakes in perfect condition on a good road surface:

Braking distance grows faster than thinking distance. Going from 20 mph to 40 mph doubles thinking distance (20 to 40 feet) but quadruples braking distance (20 to 80 feet). "I will just brake harder" fails at open-road speeds. A heavy load, faded brakes, or a poor surface makes braking longer still. The Code's caution list says: if you have a heavy load, slow down; if brakes are failing, stop and get them attended to at once.

Minimum stopping distances — dry and wet

Add thinking and braking and you get the Code's minimum stopping figures:

Wet ≈ double. The Code states that on wet roads stopping distance is approximately double that of dry roads. A Georgetown downpour, East Coast standing water, or a greasy Linden Highway after rain is not a 75-foot problem at 30 mph; it is a 150-foot problem before you even add poor tyres. The Code also says: if the road is wet or slippery, slow down; if visibility is poor through darkness or rain, slow down; if you are tired, slow down.

Metric tables in the Code

The same Code prints metric tables. Commas in the PDF are decimal commas (6,1 means 6.1 metres).

Metric braking distance

Metric thinking distance

Minimal stopping distance (dry); wet ≈ double

32 km/h is about 20 mph; 48 about 30; 64 about 40; 80 about 50; 96 about 60. The 6.1 m thinking figure at 32 km/h is the same 20 feet you already learned. Use metres if the item shows km/h; use feet if it shows mph. Do not mix 40 feet of thinking with 40 km/h.

80 km/h in this table is a speed in the stopping chart, not a claim that 80 km/h is legal on every road. On the Soesdyke–Linden Highway, 80 km/h is also the posted maximum from February 2020. At that posted speed the Code's dry stopping figure is already 53.4 m, and wet is about double. A learner's 40 km/h cap sits nearer the 32–48 km/h rows (12.2 m and 22.9 m dry).

Combined distance table — both unit systems

Memorise this table. It is the same Code arithmetic, shown so you can answer in mph or km/h without mixing units.

Fatigue and alcohol stretch thinking distance

The Code is explicit: your reaction time increases with fatigue and when you have taken alcohol. The longer you take to react, the farther the vehicle travels before braking even starts. The 20-feet-at-20-mph line assumes a good alert driver. A tired learner after a late East Bank practice, or anyone over the programme's prescribed alcohol limit (Chapter 4), is not that driver. Here you only need the stopping consequence: thinking distance grows.

A heavy vehicle, faded brakes, or a poor surface grows braking distance. Either way, danger distance grows. Leave more room. Slow down. The Schedule maximum is not a duty to travel at that speed.

How this meets Guyana roads

Left-hand traffic, minibuses, pedestrians, and wet tropical surfaces make the Code tables operational, not theoretical. On a restricted Georgetown street at 30 mph you need 75 feet dry and 150 feet wet to stop in the Code's minimum conditions. On an open-road 40 mph you need 120 feet dry and 240 feet wet. If you cannot see that far — a blind corner, a parked hire car, rain, night with dipped lights — you are already above a safe speed even if you are below the legal maximum.

On the Demerara Harbour Bridge or Canje Bridge, rule 27's "carefully and within the prescribed limit" is the same idea: the deck is not a place to spend your entire danger distance. At night, drive well within the limits of your lights. On roads under repair, go slowly. Those Code lines are how you keep danger distance shorter than the view ahead.

Independent OpenExamPrep study of these Code tables is extra explanation for the GPF theoretical sitting. It does not replace the April 2025 Road Traffic Code PDF.