# AI tells a driver in the UK to 'turn right at the roundabout' by signaling right and staying in the right lane, ignoring UK roundabout lane discipline

- **ID:** `safety/uk-driving-roundabout-rules`
- **Domain:** safety
- **Category:** traffic_law
- **Error Code:** `UK-ROUNDABOUT-RIGHT-TURN-ERR`
- **Verification:** ai_generated
- **Fix Rate:** 92%

## Root Cause

In the UK, traffic drives on the left. At roundabouts: for 'right turn' (exiting after 3/4 of the roundabout, i.e., 270 degrees), drivers must enter in the right lane, signal right on approach, keep right on the roundabout, and signal left before exiting. AI may confuse with left-hand traffic countries (e.g., Australia uses similar rules) or right-hand traffic (US/Europe) where right turn uses right lane. Incorrect signaling causes collisions: UK Highway Code Rule 186 states signal right when turning right, left when exiting. AI's advice would cause a driver to cut across lanes or fail to yield.

## Version Compatibility

| Version | Status | Introduced | Deprecated |
|---------|--------|------------|------------|
| UK Highway Code (2023 Edition, Rule 184-190) | active | — | — |
| DVSA Driving Test Standards 2024 | active | — | — |
| Road Traffic Act 1988 (as amended) | active | — | — |

## Workarounds

1. **For a right turn (3rd exit) on a standard 4-exit roundabout: approach in the right lane, signal right on approach, stay in the right lane on the roundabout, check mirrors, signal left just before your exit, and exit safely. Practice on mini-roundabouts first. Example: at a roundabout with exits at 12, 3, 6, and 9 o'clock, right turn is the exit at 6 o'clock (going back the way you came).** (95% success)
   ```
   For a right turn (3rd exit) on a standard 4-exit roundabout: approach in the right lane, signal right on approach, stay in the right lane on the roundabout, check mirrors, signal left just before your exit, and exit safely. Practice on mini-roundabouts first. Example: at a roundabout with exits at 12, 3, 6, and 9 o'clock, right turn is the exit at 6 o'clock (going back the way you came).
   ```
2. **If the roundabout has multiple lanes (e.g., spiral markings), follow road markings: for right turn, use the rightmost lane on approach and follow the spiral to the right lane exiting. Do not change lanes on the roundabout. Use the 'lane discipline' diagram from Highway Code Rule 186: 'When taking any intermediate exit, unless signs or markings indicate otherwise... select the appropriate lane on approach and stay in that lane until you need to exit.'** (90% success)
   ```
   If the roundabout has multiple lanes (e.g., spiral markings), follow road markings: for right turn, use the rightmost lane on approach and follow the spiral to the right lane exiting. Do not change lanes on the roundabout. Use the 'lane discipline' diagram from Highway Code Rule 186: 'When taking any intermediate exit, unless signs or markings indicate otherwise... select the appropriate lane on approach and stay in that lane until you need to exit.'
   ```

## Dead Ends

- **** — On a roundabout, turning right requires entering from the right lane (if two lanes). Left lane is for going straight or left (first exit). Using left lane for right turn forces crossing the path of vehicles exiting from inner lane. (80% fail)
- **** — Hazard lights are for emergencies only; using them on a roundabout confuses other drivers and is illegal (Road Traffic Act 1988, Section 36). (95% fail)
- **** — UK law requires signaling (Highway Code Rule 186). Failure to signal is a traffic offense (3 points fine). Other drivers cannot anticipate un-signaled turns, causing rear-end or side collisions. (70% fail)