Route management

Closing the road to through traffic usually refers to building a raised kerb area across the road, with an obstruction such as bollards, trees or flower beds.

Effectiveness

Closing the road to through traffic with an obstruction will greatly reduce the number of vehicles using the road. 

It is extremely likely a reduction in vehicle traffic will increase safety. However, this depends on the length of the road as less traffic can encourage higher speeds and lower attention levels by drivers. The obstruction may also reduce vehicle speeds.

Advantages to closing roads to through traffic

• Removes all vehicle through traffic
• Relatively cheap way to reduce traffic volume
• The road obstruction could contribute to the character of the area, e.g. with trees or artwork - however this would increase costs
• Can be designed to allow access for cyclists

Disadvantages to closing roads to through traffic

• Could cause delay to emergency services
• May cause longer journeys for local residents
• Traffic is displaced and problems due to 'rat running' through other residential streets can arise
• Can be a hazard for pedestrians with visual impairment
• Can cause difficulty for people with mobility scooters

Restrictions

• Highways engineers must carry out checks to determine if other roads in the area will be suitable to carry the extra traffic.

• This scheme requires a Traffic Regulation Order and a Road Safety Audit.

Cost of installation

• £14,000

The modal filter cost based on 6m wide carriageway using standard kerbs and Cambridge bollards, installed under a road closure.

One way street (Non-complex)

A one way street only allows vehicles to move in one direction down the road. ‘No-entry’ signs are used to prevent vehicles travelling the wrong way along the road, and sometimes road junctions are redesigned to make it difficult to turn against the flow of traffic. For traffic travelling in the correct direction, arrow signs are used to show it is a one way street.

Effectiveness

If a road is currently a narrow two way street where motor vehicles need to slow down to pass each other, changing the road to a one way street will increase vehicle speeds. Vehicle drivers may also be tempted to drive faster because they do not expect any oncoming vehicles.

If motor vehicles speeds increase, this will reduce how safe the road is.

Advantages of a one way street

• Can prevent vehicles using the road as a short cut
• Can create more road space for car and cycle parking
• Can create more space for widening footways / cycleways
• Can help traffic to move more freely

Disadvantages of a one way street

• Likely to increase vehicle speeds
• Motor vehicles and emergency vehicles may need to travel greater distance to get to their destination

One way exceptions

Many one way streets in Cambridge have an exception for bicycles, this is also known as a cycle contraflow. This keeps the city accessible to cyclists, who may find journeys longer and more difficult with an increasing number of one way streets.

 Restrictions

• Only usually used on local residential roads, where an alternative major route is available.

• For some roads, they will be too important to the Cambridge’s transport network to allow them to become a one way street.

• This scheme requires a Traffic Regulation Order and a Road Safety Audit

Cost of installation

• £15,000

The one-way street cost is based on two new illuminated signs plus the electrical connections, installed under two-way lights.

Weight limit (Non-complex)

A weight limit allows the Highway Authorities, like Cambridgeshire, to prohibit and restrict the movement of heavy goods vehicles (HGVs).

HGV movements can have a detrimental impact on local communities in terms of environmental intrusion and the perception of road safety. However, consideration must be given to the status and design of the existing route and whether HGVs can be re-routed without impacts on other settlements. If a weight limit is likely to divert trips to a lower status route, these roads could be less capable of heaver traffic, poorer geometry and have a less robust road structure therefore making them unsuitable to take diverted vehicles. 

Effectiveness

It is difficult to restrict the movement of HGVs as they are permitted to use any classification of road for access and deliveries even if there is a weight restriction. 

Advantages of weight limits

• Reduces congestion in town centres
• Fewer HGVs use villages as shortcuts
• Improves air quality

Disadvantages of weight limits

• Exemptions for emergency services, highways maintenances vehicles, agricultural vehicles and buses
• In rare cases, high costs can come from the need for a public enquiry if there are objections during the formal consultation process
• Access and deliveries are still permitted
• Current police resources and operational commitments may not allow for routine or targeted enforcement

Restrictions

• Must be in accordance with the advisory freight map available on our heavy loads webpage
• Be developed using the strategy assessment process - you can find out more about the weight limit strategy assessment process in our Heavy Goods Vehicle Policy
• Have considered all other options with formal restrictions being the last resort
• All weight limits must have full support from the Police
• Weight limits require a Traffic Regulation Order and a Road Safety Audit

Cost of installation

• £28,000

The weight limit cost is based on four terminal signs and provision of 4 advisory signs including electrical connections, installed under two-way lights.