 | ||||
|---|---|---|---|---|
 A405 west of Park Street | ||||
| Route information | ||||
| Length | 4.8 mi (7.7 km) | |||
| Major junctions | ||||
| West end | Leavesden Green | |||
 A41 A412 M1 M25 A414 A5183 | ||||
| East end | St Albans | |||
| Location | ||||
| Country | United Kingdom | |||
| Primary destinations | Watford | |||
| Road network | ||||
| ||||
The A405 is a 4.8 miles (7.7 km) dual carriageway road in Hertfordshire, England, from the A41 at Leavesden Green, near Watford, to the A414 at Park Street Roundabout near St Albans.