---
title: Junctions on Dual Carriageways
---

# Junctions on Dual Carriageways

## Dual Carriageways

Dual carriageways have lanes divided by a **central reservation**, sometimes with barriers.

They often resemble motorways but may contain **slower traffic** such as tractors or cyclists. 

## Emerging from a Side Road

#### Turning Left

- If no slip road exists, emerge as from a normal major road.
- If a slip road is provided:
  
    - Use it to adjust speed and merge safely.
    - Match your speed to the main traffic flow.
    - Join only when it’s clear you won’t force others to slow or swerve.
    - Remain in the **left-hand lane** until you’ve matched the general traffic speed.

#### Turning Right

- You must first cross the **near-side carriageway**.
- Only proceed if the **central reservation** is deep enough to contain your vehicle safely.
- If it isn’t, wait until both carriageways are clear before crossing.
- Take extra care with **long vehicles** or **trailers**.

**Defensive Driving Tip:**

Motorcyclists can be hard to see and may be overtaking slower vehicles. Look twice before crossing or joining.

## After Joining the Carriageway

- Check mirrors and cancel your signal.
- Stay in the left lane until you’re used to the flow.
- Accelerate smoothly to a safe speed.
- Watch for signs showing a new speed limit.

## Leaving a Dual Carriageway

#### Turning Left

- If no slip road exists, follow the standard left-turn procedure.
- If there is a slip road:
  
    - Use MSM/PSL early.
    - Signal well in advance — speeds are higher.
    - Reduce speed in good time.

#### Turning Right

- Move into the right-hand lane early.
- Follow lane markings and signal clearly.
- Be extremely careful — you may need to cross multiple lanes of fast traffic.
- If in doubt, wait.

#### QUICK NAVIGATION

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