Light segregation

Light segregation or light protection is an engineering technique to protect cyclists using a cycle lane by placing physical objects next to the cycle lane marking.

A cycle lane protected by Zicla-brand armadillo

A wand-protected contraflow cycle lane in St Helier, Jersey

It first became a recognised treatment on the issue of the NACTO Urban Bikeway Design Guide in the United States in 2011, though it existed in different countries before then. They are intended to be a cheaper and easier-to-implement alternative to kerb protection. The estimated cost of kerb protection is £700,000/km, however the cost for light segregation is only around £60,000/km. Light segregation permitted Seville to implement a 80-kilometre (50-mile)-long cycle network in four years.

Benefits

In Royal College Street, Camden, London, light segregation was introduced. The number of cyclists increased by 70% and the number of collisions reduced from 18 per 15 months to 3 per 15 months. Users feel safer on light-segregated cycle lanes than paint-only cycle lanes.

Criticism

However, light segregation has been criticised for creating a trip hazard for pedestrians and a collision risk for cyclists. Objects in the carriageway may also be struck by a vehicle, which might also harm vulnerable road users. Light segregated lanes when badly designed can compromise accessibility for disabled people, prevent access to the kerbside for motor vehicles (e.g. to let passengers out of the vehicle). Another issue are bus stops. Light segregation would require buses to stop away from the kerb or in the cycle lane. The solution – bus stop boarders – put cyclists and boarding/deboarding passengers into direct conflict with one another. Bus stop bypasses cannot be achieved through light segregation, but can be tied into light segregation schemes.

Products

Different products which can be used for light segregation are:

• Flexible posts
• Lacasitos
• Armadillos
• Orcas
• Planters
• Wandorcas