Reserved lane, mandatory for cycles and PMVs
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Sign **R-421** indicates that the lane is **reserved and its use is mandatory** for:

- **Cycles** (bicycles and other pedal-powered vehicles).
- **Personal mobility vehicles (PMVs)**, such as electric scooters that comply with regulations.

This implies two things:

1. **Obligation**:
Drivers of **cycles** and **PMVs** must **use that lane** when they encounter this sign.

2. **Prohibition for other users**:
The use of that lane is **prohibited** for **other vehicles and pedestrians**, who may not use it.

In summary, it is a lane **exclusively** for cycles and PMVs and its use is **mandatory** for them and **forbidden** for the rest.