About This Camera
Camera Location & Hazard Overview
The A312 Parkway meets the M4 at Junction 3, one of the busiest and most complex interchanges on this entire corridor, and this camera offers essential viewing for anyone planning to join or leave the motorway at this exact point. Given how quickly this interchange can back up once volumes rise, checking this feed before committing to the junction is genuinely worthwhile for regular users of this route into or out of London.
Traffic Pattern & Congestion Trends
Congestion builds sharply during peak hours as motorway traffic merges with the local Parkway flow, with queues sometimes extending back onto the M4 slip roads themselves during the worst periods, a knock-on effect that can briefly slow motorway traffic well before drivers actually reach this junction on the approach itself, particularly during the Friday evening getaway period when both the motorway and the local road struggle together, a high-speed merge that regularly produces the kind of collision behind a car accident compensation claim if drivers misjudge the gap.
Traffic Fines & Camera Enforcement
Average speed cameras operate on the Parkway approach, while the M4 itself remains subject to smart motorway variable speed limit enforcement through its own separate camera network positioned close to this specific junction, meaning two distinct enforcement systems effectively overlap at this one interchange. The high-speed nature of this interchange means any contact here is more likely to lead to a genuine car crash claim than a simple wing-mirror scrape.
Road Closures & Alternative Routes
The A4 Great West Road offers a parallel, if often equally congested, alternative for drivers trying to avoid this specific interchange when it's severely backed up and the delay looks set to continue for some time rather than clearing quickly on its own within a few minutes of the initial delay first being reported to control room staff monitoring the network.
Driver Safety & Local Tips
Motorway traffic joining the Parkway here can sometimes misjudge the merge, especially in poor visibility — allow extra following distance if you're using this junction during heavy rain or fog, when reaction times understandably slow across the board for every driver involved.
ULEZ & Emissions
The London Borough of Hounslow operates entirely within the expanded Ultra Low Emission Zone (ULEZ), active 24/7. Non-compliant vehicles face a £12.50 daily charge. No Congestion Charge applies here, but be aware of Heathrow drop-off charges nearby. Check your vehicle compliance at tfl.gov.uk.
Parking near A312 Parkway/M4 J3, West London
Right at the M4 Junction 3 interchange itself there's no legal parking given the road's function as a motorway approach, but the surrounding Hounslow residential streets a short distance away carry a mix of CPZ restrictions and free parking depending on the exact road. Check entry signage carefully, since Hounslow manages zones individually rather than borough-wide. There's no dedicated public car park directly at this interchange; the nearest options sit back towards Hounslow town centre or Feltham. Single yellow lines near the slip roads restrict any stopping at all times given safety considerations. Hounslow's full CPZ map is at hounslow.gov.uk/parking/controlled-parking-zones for the surrounding residential area.
If on-street parking is hard to find, apps like JustPark and YourParkingSpace let you pre-book a private driveway or car park nearby — typically from around £2–£6 per hour or £10–£25 per day depending on how central the location is.
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