AdminThe route-planning section of the topographical test can feel stressful, especially if you are new to London’s road network. Many candidates know how to drive but still lose marks because they misread the map, choose the wrong route, or run out of time.
The good news is that these mistakes are predictable. Once you know what to look for, you can build a simple process and approach each question with more confidence.
This guide explains 10 common route-planning mistakes, what they look like in practice, why they cost marks, and exactly how to avoid them.
If you are preparing for your PCO test, keep this article beside you during your practice sessions.
1. Memorising routes instead of learning the road network
What it looks like in practice
You remember a route from a previous lesson or mock test and try to use it again when the start and destination change.
For example, you may memorise that a particular road connects two areas. However, the question may require a different route because of a one-way system, a restricted turn, or a different starting point.
Why it costs marks
The test checks your ability to read and plan a route, not repeat a route from memory. A memorised answer may take you in the wrong direction or lead to an illegal turn.
The fix
Build your understanding of:
- Major north-south and east-west roads
- Main river crossings
- The M25 and key motorway connections
- Central London one-way systems
- Bridges, tunnels and large roundabouts
- How major roads connect different areas
Use the map to confirm every route. Do not assume that a familiar journey is automatically the correct answer.
2. Misreading the start, destination or journey leg
What it looks like in practice
You begin at the destination instead of the starting point. Alternatively, you answer the second part of a journey when the question asks about the first leg.
This often happens when a question contains several locations or instructions.
Why it costs marks
A correct route in the wrong direction is still the wrong answer. Starting from the wrong road or junction can also lead you to choose turns that are not available from the actual starting point.
The fix
Before looking for a route, pause and identify three things:
- Where does the journey start?
- Where does it finish?
- What exactly is the question asking you to provide?
Point to the start and destination on the map. Say “start to finish” quietly to yourself before planning.
Do not begin tracing the route until you are certain which direction you are travelling.
3. Ignoring one-way systems and prohibited turns
What it looks like in practice
You choose a route that appears direct, but it requires:
- Travelling the wrong way down a one-way road
- Turning right where a no-right-turn symbol is shown
- Turning left where the movement is prohibited
- Entering a road from the wrong direction
- Crossing a central reservation or restricted junction
Why it costs marks
The shortest route is only useful if it is permitted. A route that ignores a restriction is not a valid answer, even if it looks quicker on the map.
The fix
Check each junction as you travel through it. Do not only study the start and finish.
At every turn, ask:
- Is this road one-way?
- Is my direction of travel allowed?
- Is the turn permitted?
- Is there a roundabout or central reservation?
- Is the road closed or restricted?
Learn the map symbols during your topographical test training. The more familiar they become, the less time you will spend hesitating.
Insider Tip: Trace the route with your finger one junction at a time. If your finger crosses a restriction, stop immediately and find an alternative before continuing.
4. Choosing the shortest-looking route without checking crossings
What it looks like in practice
You select a route that looks short because the start and destination are close together. However, a river, railway, major road or other barrier sits between them.
You then discover that the nearest crossing is much further away than expected.
Why it costs marks
London’s geography can make a route look simple when it is not. A river crossing, bridge or tunnel may determine the entire route.
The route that looks shortest on the map may not be the most direct permitted route.
The fix
Before tracing the detailed streets, identify the major barriers between the two points:
- River crossings
- Bridges
- Tunnels
- Railways
- Motorways
- Large parks or restricted areas
Then locate the realistic crossing point. Plan the route around that crossing rather than trying to force a straight line through an obstacle.
5. Forgetting the M25 and major motorway connections
What it looks like in practice
You focus on local roads and miss an important connection through the M25 or another major route. You may also assume that the M25 is only relevant for journeys outside London.
Why it costs marks
The M25 links several major roads around London. It can be the most direct way to reach a destination, particularly when the journey crosses outer London or connects with another motorway.
Ignoring it may leave you with a long, complicated route through local streets.
The fix
Practise identifying:
- Where the M25 sits around Greater London
- Which major roads connect to it
- How motorway links affect outer-London journeys
- When a local route is more appropriate than a motorway connection
You do not need to memorise every road. Focus on the main network and how it connects different parts of London.
6. Relying on sat-nav habits instead of map-reading skills
What it looks like in practice
You expect the computer to suggest the answer automatically. You look for a route that feels like something a sat-nav would choose, rather than checking the map symbols and instructions yourself.
You may also use real-world traffic knowledge to choose a route that is not the most direct option shown by the test.
Why it costs marks
A sat-nav normally prioritises factors such as traffic, speed, road closures or your personal settings. The topographical test requires you to interpret the map and follow the question carefully.
The best test answer may not be the route you would drive during a busy weekday.
The fix
Practise without navigation apps. Develop the habit of:
- Reading the question
- Finding the exact start and destination
- Identifying major roads and barriers
- Checking restrictions
- Selecting the most direct permitted route
- Reviewing every turn
Your real driving experience is valuable, but it must support your map-reading rather than replace it.
7. Spending too long on one difficult question
What it looks like in practice
You become stuck between two possible routes. You keep checking the same junction and use several minutes without reaching a decision.
This leaves less time for the remaining questions.
Why it costs marks
A single difficult question can affect your performance across the whole test. Even if you eventually solve it, you may rush later questions and make avoidable errors.
The fix
Use a time-management rule:
- Make an initial plan
- Check the key restrictions
- Choose the strongest permitted route
- Move on if you cannot find a better option
If the format allows you to return to a question, mark it mentally and continue. Do not let one route consume your entire focus.
Insider Tip: A route does not need to feel perfect. It needs to answer the question, follow the map rules and provide the most direct permitted journey.
8. Rushing without checking the completed route
What it looks like in practice
You find a route quickly and submit it without tracing it back from start to finish. Later, you notice that one turn was impossible or that you missed a shorter connection.
Why it costs marks
Small errors often happen at the final junction. A quick review can reveal:
- A missed turn
- An incorrect direction
- A road restriction
- A route that does not reach the correct destination
- An unnecessary loop or detour
The fix
Build in a short route review before finalising your answer. Check:
- Start: Did the route begin at the correct point?
- Direction: Did you travel towards the destination?
- Turns: Is every turn allowed?
- Barriers: Did you use the correct crossing?
- Finish: Does the route end at the exact destination?
This simple habit can protect marks that you have already worked hard to earn.
9. Not practising in a computer-based environment
What it looks like in practice
You practise only with a paper map. On test day, the computer interface feels unfamiliar, and you spend too much time finding tools, moving around the map or entering your answer.
Why it costs marks
Route planning is not only about knowing London. You also need to work confidently within a digital environment.
A lack of computer practice can increase anxiety and slow down your decisions.
The fix
Include computer-based practice in your preparation. Work on:
- Moving around the digital map
- Zooming in and out efficiently
- Finding start and destination points
- Planning routes on screen
- Reviewing route lines
- Completing questions under timed conditions
At PCO GO, our computer-based training helps you practise using software similar to the assessment environment. This means the screen feels familiar before your test day.
10. Leaving training too late or skipping realistic mocks
What it looks like in practice
You book your test first and begin training a few days before it. You may watch general videos but do not complete a full pco topographical test mock under timed conditions.
Why it costs marks
Last-minute preparation does not leave enough time to correct repeated mistakes. It can also create unnecessary pressure, especially if you are still learning basic map symbols or computer controls.
The fix
Start early and use a clear preparation plan:
- Complete an initial skills check
- Practise your weakest areas
- Repeat route-planning exercises
- Take realistic timed mocks
- Review every incorrect answer
- Book the assessment when you feel ready
A mock test should not simply tell you whether you passed or failed. It should show you why you made each mistake.
Quick pre-test route-planning checklist
Before submitting any route, ask yourself:
- Have I identified the exact start point?
- Have I identified the exact destination?
- Am I travelling in the correct direction?
- Have I checked one-way roads?
- Have I checked no-turn restrictions?
- Have I considered rivers, bridges and tunnels?
- Have I looked for major roads and M25 connections?
- Is this the most direct permitted route?
- Have I reviewed every junction?
- Am I managing my time sensibly?
Prepare with PCO GO
You do not need to learn every London road before you can pass. You need the right process, regular practice and feedback on the areas causing you problems.
PCO GO provides topographical test training from £99, with:
- Computer-based route-planning practice
- Real exam-style mocks
- One-to-one trainer support
- Guidance on map symbols and restrictions
- Practical help with time management
- Support for beginners and experienced drivers
Our topographical training is designed to build the skills you need for the assessment, not just help you memorise answers.
If you are working towards your full PCO licence, we can also help with PCO licence application support, DBS checks, and medical appointments. Once you are ready for the wider licensing process, our team can also provide SERU test prep and job advice.
Contact PCO GO to discuss your preparation and book support that matches your experience level.
Frequently asked questions
Is the topographical test difficult?
It can be challenging if you are unfamiliar with London’s road network or computer-based route planning. With structured practice and realistic mocks, the process becomes much more manageable.
What is the best way to practise route planning?
Practise using a mixture of London map-reading exercises, timed route questions and computer-based mock tests. Always review your mistakes instead of simply repeating the same routes.
Do I need to memorise all London roads?
No. You need a working understanding of the major roads, crossings, motorway connections and common restrictions. The test is about applying map-reading skills accurately.
What is included in a pco topographical test mock?
A realistic mock should test your ability to identify locations, plan routes, follow map restrictions and work under time pressure. At PCO GO, trainers also help you understand and correct your mistakes.
Can beginners take topographical test training?
Yes. One-to-one training can start with basic map reading and gradually move into route planning, computer practice and full exam-style mocks.
Does PCO GO help with more than the topographical test?
Yes. PCO GO supports the wider PCO training London process, including application support, DBS checks, medical appointments, SERU test prep, computer-based training and job advice.