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Cardiff Council

Weight Limit Restrictions

​​​​​While we try to keep Cardiff’s roads available to all traffic wherever possible, sometimes there are circumstances when we need to impose weight restrictions on the movement of heavy vehicles. These restrictions fall into two categories – structural and environmental. 

Structural Weight Limits​

These restrictions are placed on structures, such as bridges over railway tracks or rivers, which are not strong enough for heavy vehicles to cross. Signs will inform drivers of the maximum gross weight that the vehicle must not exceed. 

It is important to adhere to any structural weight limit. Failing to adhere to a structural weight limit could cause the structure to collapse with the potential for serious damage or loss of life. It is also a criminal offence and you may be prosecuted if you drive your vehicle over the structure when not permitted to do so. 

Our structural weight restrictions are: 

Location​ Structure​​​Weight Limit
​​Caerphilly road (A469)
​Over-rail bridge
​18 tonnes temporary order
College Road (Llandaff North)
Over-rail bridge26 Tonnes
Crofft-y-genau RoadCulvert18 Tonnes
Heath Halt RoadOver-rail bridge18 Tonnes
Highfield Road
Over-rail bridge3 Tonnes
Leckwith RoadBridge over the river Ely7.5 Tonnes
Station Road (Creigiau)Over-rail bridge18 Tonnes
Station Road (Llandaff North)Over-rail bridge7.5 Tonnes
Tyn-Y-Coed Road (Creigiau)Culvert18 Tonnes​

​​​Environmental Weight Limits​​​​​

Weight restrictions can be placed on roads to prevent their use by heavy goods vehicles (HGVs) for environmental reasons. Most often this is to prevent HGVs from using minor roads as shortcuts between main routes, particularly if they go through residential areas.   

Environmental weight limits can be applied to individual routes or to zones and normally apply to HGVs over 7.5 tonnes maximum gross weight. However, environmental weight limits usually have an exemption for certain activities such as vehicles making deliveries to businesses within the zone. 


Currently only the Police and Trading Standards have the powers to enforce structural weight limits. 

We have CCTV enforcement cameras that monitor some environmental weight restrictions and can issue Penalty Charge Notices (PCNs) to offenders.

Unfortunately, where exemptions for access apply, enforcement can be very difficult as we would have to follow every HGV through the length of the restriction to check for any permitted activities before a PCN could be issued. 

Our environmental weight limits that do not have exemptions for access are:

Location Weight Limit Sign Camera enforced?
Ty-Nant Road:
Between Pughs Garden Centre Retail Village and Ffordd Treforgan
7.5 Tonnes maximum gross weight (except permit holders) 7.5t weight limit
Yes – at all times​

Access Permits​

Traffic Access Permits allow you to drive HGVs in certain restricted roads when you require access to load/unload. 

For regular access you can obtain a Traffic Access (Delivery Permit) and for temporary access of up to 7 days you can apply for a Traffic Access (Delivery Waiver). ​

Location​ Restricted Road Weight Limit​Permit Zones

Radyr / Morganstown
Ty-Nant Road
7.5 Tonnes
​All properties​ only accessible from Heol Isaf or Ty-Nant Road (south of its roundabout junction with Ty-Nant Court)​

You will only need to apply for a permit if your vehicle exceeds the weight limit. 

Access permits are not parking permits, and when undertaking loading/unloading any parking and waiting restrictions that may be present must still be adhered to. They will not be issued for HGVs delivering to the Plasdwr development under any circumstance. 

Delivery Permits​​​​

Delivery permits are for when you require regular access to load/unload. 
Delivery permits can be applied for online​​​​​​​​​​​External link opens in a new window​ using our MiPermit Cardiff service.

To confirm that you have a legitimate requirement for access you will first have to apply for a delivery permit account.

You will need to upload evidence to show why you require access, such as: 
  • A delivery schedule or contract, or
  • A covering letter on company headed paper detailing why access is required and signed by an appropriate person such as a manager or company director

If your account is approved you will then be able to register your vehicles for delivery permits. We aim to review all account applications within 7 working days. 

Delivery permits are free and as they are virtual you will not be required to display anything in your vehicle. Terms and conditions apply. 

Temporary​​​ Waiver Permits

Temporary delivery waivers are for when you require short term access to load/unload. 

You will need your vehicle registration details and evidence of your requirement for access (such as a delivery invoice) to hand.

Delivery waivers are free and last for up to 7 days. As they are virtual you will not be required to display anything in your vehicle. Terms and conditions apply.