Traffic Control Measures (WJEC GCSE Physics: Combined Science)

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Ann H

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Ann H

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Traffic Control Measures

  • There are two ways to make travelling in a car safer:
    • Having cars move at a slower speed, so the stopping distance is shorter
    • Making traffic collisions safer if they do happen

Reducing Traffic Speed

  • There are many methods employed on UK roads to reduce the speed cars can travel:
    • Speed limits
    • Speed humps
    • Speed cameras

Speed limits 

  • Speed limits tell drivers the maximum speed they are legally allowed to drive on a section of a street
  • In most urban (town) areas across the UK, the speed limit is 30 mph (miles per hour)
  • In residential areas across the UK, the speed limit is sometimes reduced to 20 mph
    • This is because there is a higher risk of hazards on the road
      • Children playing
      • People walking
      • Other cars parking or manoeuvring
      • People opening car doors
      • Pets crossing the road
      • People taking longer to cross the road
  • In Wales, most 30 mph roads have been changed to 20 mph roads
  • This decision was made to:
    • Reduce the number of collisions and resulting injuries
    • Encourage more people to walk, cycle or use public transport 
    • Improve the health of Welsh citizens
    • Make the streets safer
    • Reduce air pollution

  • A speed limit is indicated by the number of miles per hour inside a red circle on a post next to the road

An Example Speed Limit Sign

2-1-example-speed-limit-sign

A 30 mph speed limit sign

  • Speed humps are used to force drivers to slow down
  • They are often used:
    • On roads prone to accidents
    • Outside schools and hospitals
    • In residential areas
  •  Driving over speed humps can cause damage to cars and be uncomfortable for passengers

An Example of a Speed Hump

2-1-example-of-speed-hump

A speed hump in the road is designed to slow cars down

 

  • Speed cameras 
    • Can be both mobile or permanent
  • Mobile cameras are set up by the Police along any stretch of road
    • They record the instantaneous speed of cars using a laser gun
    • They are set up in areas notorious for speeding and dangerous driving

An Example of a Mobile Speed Camera

2-1-mobile-speed-cameras

Police officers set up mobile speed cameras to temporarily check the speed of passing motorists

  • Permanent speed cameras are erected on posts and record the speed of cars 24 hours a day
    • They measure the average speed of cars over a set distance
    • Are marked by white lines on the road
  •  Permanent speed cameras are constructed along stretches of road where there may have been accidents or where mobile speed cameras have caught many offenders 

An Example of a Permanent Speed Camera

2-1-permanent-speed-cameras

A permanent speed camera is constructed on a pole on the side of the road and is always recording the speed of passing cars

  • If speed cameras catch motorists travelling above the speed limit then they can receive one or a combination of the following:
    • A fine
    • A warning
    • Further training via an online training course
    • Points on their driver's license

Safety Features in Cars

  • There are many strict requirements in place for the safety features installed in modern cars
  • These include:
    • Crumple zones
    • Airbags
    • Seat belts
  • Car manufacturers are held accountable for how well these features perform 
    • New and old models of cars undergo regular testing to ensure they are up to standard
  • Police officers are responsible for enforcing the law that all passengers travelling in a car are wearing a seatbelt
    • A seatbelt restricts the distance a passenger will move during an impact
    • It can stop a passenger from falling through the front windscreen for example

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Ann H

Author: Ann H

Expertise: Physics

Ann obtained her Maths and Physics degree from the University of Bath before completing her PGCE in Science and Maths teaching. She spent ten years teaching Maths and Physics to wonderful students from all around the world whilst living in China, Ethiopia and Nepal. Now based in beautiful Devon she is thrilled to be creating awesome Physics resources to make Physics more accessible and understandable for all students no matter their schooling or background.