We can design better intersections that are safer for all users



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When cars, trucks, bikes and pedestrians come together at an intersection, design makes the difference between collisions and safety.
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Paul Salmon, University of the Sunshine Coast and Gemma Read, University of the Sunshine Coast

This is the sixth article in our series, Moving the Masses, about managing the flow of crowds of individuals, be they drivers or pedestrians, shoppers or commuters, birds or ants.


A major issue for road safety is collisions at intersections between vehicles and vulnerable road users such as cyclists, motorcyclists and pedestrians.

In such collisions, often the driver is momentarily unaware of either the vulnerable road user or of their planned path through the intersection. While many factors can cause this lack of “situation awareness”, the design of the intersection is critical. With numbers of vulnerable road users increasing, how intersections are designed requires urgent attention.

The status quo

If you look at the intersections in your local area, many appear to have been designed primarily with drivers and efficiency in mind. The designs show little consideration of the needs of vulnerable road users. Typically, we see high speed limits, no dedicated bicycle lanes through the intersection, no filtering lanes for motorcyclists, and short crossing times for pedestrians.

This can make it difficult for vulnerable road users to pass through safely. And critically, the lack of overt protection for these vulnerable users also reduces drivers’ expectation of encountering them. This can lead to something that we call a “looked-but-failed-to-see error”: drivers are not aware of vulnerable road users even though they may have looked at them (this phenomenon is explained here).

In response to these problems, we recently completed research using a series of on-road studies to understand:

  1. how different road users interact at intersections

  2. what they need to know to support safe interactions.

Our next step involved using a sociotechnical systems-based design process to create new intersection design concepts. A sociotechnical system is any system in which humans and technology interact for a purposeful reason. Our aim was to develop a series of new intersection designs that better support the “situation awareness requirements” of all users.

Understanding the diversity of users

The most important finding from our on-road studies was that different road users experience the same intersection situations differently. Critically, these differences can create conflicts.

For example, drivers tend to be concerned with what is ahead of them, and specifically the status of the traffic lights. In contrast, cyclists and motorcyclists are concerned with working out a safe path and then filtering safely through the traffic. Thus, drivers who are not expecting them are often not aware of them or of what they might do next.

A key implication of our findings was that intersections should be designed to cater for the diverse situation awareness needs of all road users. The environment should facilitate safe interactions by ensuring that all road users are aware of each other and understand each others’ likely behaviours.

Based on this, we set about designing a series of new intersections using a sociotechnical systems design approach. Among other things this approach aims to create systems that have adaptive capacity and can cope with a diverse set of end user needs.

To achieve this, it proposes several core values, including that:

  • humans should be treated as assets rather than unpredictable and error-prone
  • technology should be used as a tool to assist and not replace humans
  • design should consider the specific needs and preferences of different users.

Designs for better intersections

We used these values as part of a participatory process to create three intersection design concepts. The design brief was to replace one of the intersections from the on-road studies (see below).

Figure 1. Bird’s-eye view (above) and first-person view (below) of the intersection to be replaced with new design, Map data ©2012 Google.
Author provided

When we evaluated the designs with drivers, cyclists, motorcyclists and pedestrians, two of the designs performed best against key criteria: alignment with sociotechnical systems values, attainment of key intersection functions (such as to minimise collisions, maximise efficiency, maximise compliance, optimise flexibility), and user preferences.

The first design is known as the “turning team” design. It works on the premise that different road users could work effectively as a team when proceeding through the intersection. To do this the design aims to make drivers explicitly aware of other forms of road user (to connect the team) and provides each with a clear and dedicated path through the intersection.

Like all good teams whose members function based on different roles, the design aims to clear cyclists from the intersection before allowing motorised traffic to enter. Other features include a pedestrian crossing path wide enough to accommodate cyclists who are not comfortable with using the road, motorcyclist filtering lanes, and phasing of traffic lights based on road user type and direction of travel.


CC BY-ND

The second design is the “circular” concept. It explicitly separates motorised and non-motorised traffic. A circular pathway around the intersection is provided for pedestrians and cyclists to use. This pathway links with cycle lanes running down the centre of the road, separated by a kerb from the roadway.

On the roadway, this design provides a separate bus lane and a motorcycle zone at the front of the intersection to encourage motorcyclists to filter to the front. Finally, the design incorporates signs warning motorists to be on the lookout for cyclists and for motorcyclists filtering through the traffic from behind.


CC BY-ND

The way forward for intersection design?

The road transport systems of the future will be markedly different to those of today. Intersections will become intelligent, with the capacity to “talk” with vehicles, and driverless vehicles will negotiate intersections for us.

This is a long way off, however. In the shorter term, intersections will likely comprise a complex mix of standard vehicles, driverless vehicles and partially automated vehicles, as well as cyclists, motorcyclists, pedestrians, and perhaps new forms of vulnerable road user. Without change, intersections will continue to kill and injure at an unacceptable rate.

Our research provides important messages for how the intersections of the future should be designed. Designers should equally consider the needs of all users, rather than considering drivers first and the rest afterwards. Critically, this should extend to driverless vehicles and automated systems. What, for example, are the situation awareness needs of a fully driverless vehicle when negotiating an intersection? How can intersection design support these needs as well as those of human users?

Designers should not fall into the trap of assuming that all road users require the same information when negotiating intersections. While separating them physically, the intersection of the future should aim to connect its users cognitively.


We would like to acknowledge our colleagues and collaborators who have contributed to this research, including Professor Mike Lenne, Associate Professor Guy Walker, Professor Neville Stanton, Dr Natassia Goode, Dr Nick Stevens and Dr Ashleigh Filtness.

The ConversationYou can find other articles in the series here.

Paul Salmon, Professor of Human Factors, University of the Sunshine Coast and Gemma Read, Research Fellow in Human Factors & Sociotechnical Systems, University of the Sunshine Coast

This article was originally published on The Conversation. Read the original article.

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Cyclone Debbie: we can design cities to withstand these natural disasters


Rob Roggema, University of Technology Sydney

What happens after Cyclone Debbie is a familiar process. It has been repeated many times in cities around the world. The reason is that our cities are not designed for these types of events. The Conversation

So we know what comes next. Queenslanders affected by Debbie will complain about the damage, the costs and the need for insurers to act now to compensate their losses. The state and federal governments will extensively discuss who is to blame.

The shambles will be cleared and life will eventually get back to normal. Billions of dollars will be spent on relocating people and on repairing the damage and public works. A state-level levy may even be necessary to pay for all the extra costs. Two storms, Katrina and Sandy, cost the United States more than US$200 billion between them.

Yet we know what cyclones do. They bring, for a relatively short time, huge gusty winds. These are inconvenient but have proven not too damaging.

The greatest risk comes from storm surge and rainfall. Both bring a huge amount of water. And all this water has to find a way to get out of our living environment.

Despite knowing, approximately, where cyclones tend to occur, we never thought about adjusting our cities to their effects. It would make a huge financial difference if we did.

So, what can we do to build our cities differently to ensure the impacts of cyclones – and the accompanying rainfall and storm surges – do not disrupt urban life? The answer to all of this is design.

The usual design of current cities and towns brought us problems in the first place. We need to fundamentally rethink the design of our built-up areas.

Rethinking coastal and urban design

It starts with coastal design. We are used to building dams and coastal protection against storm surges happening once in 100 years. For comparison, the protection standards in the low-lying Netherlands are designed to protect the country against a once-in-10,000-years flood. But nature has proven to be stronger than our artificial constructs can handle.

An alternative design approach is to rely on the natural coastal processes of land forming – such as reefs, islands, mangroves, beaches and dunes. Humans can help the formation of these natural protectors by providing the triggers for them to emerge.

As an example, when we put sand in front of the coast, the currents and waves will transport the sand towards the coast and build up new and larger beaches. This example is realised in front of the Dutch coast and is known as the sand engine. But nature will build them up to form a much stronger system than humans ever could.

Instead of coasts, beaches and real estate being washed away, new land and larger beaches may be formed as a result of these processes. This requires design thinking, insights into the resilience of the coastal system, and understanding of the natural forces at play.

Second, urban design should reconsider the way we build our cities. Most urban areas do not have the capacity to “welcome” lots of water. And it is about lots of water, not the average shower or two.

Until cyclones are gone, these enormous amounts of water need to be stored for a short period in dense urban areas. This goes beyond water-sensitive urban design.

Despite the benefits of water-sensitive design in many urban developments, when the going gets tough, this is just not enough. Water-sensitive urban design can barely cope with average rainfall peaks. So, in times of severe weather events, cities need to have additional spaces to store all this water.

The general rule here is to store every raindrop as long as possible where it falls.

How and where should we redesign our cities?

So, what can be done to cyclone-proof our cities? We can:

  • Create larger green spaces, which are connected in a natural grid, increase the capacity of these green systems by adding eco-zones and wetlands, and redesign river and creek edges. Remove the concrete basins from every creek in the city.

  • Use large public spaces, such as parking spaces near shopping centres, ovals and football pitches, for temporarily capturing and storing excess rainwater. Small adjustments at the edges of these places are generally enough to capture the water.

  • Turn parking garages into temporary storage basins.

  • Redesign street profiles and introduce green and water-zones in streets. Out of every three-lane street, one lane can be transformed into a green lane, which can absorb rainwater.

  • Redesign all impervious, sealed spaces and turn these into areas where the water can infiltrate the soil. Use permeable materials.

  • Think in an integrated way about street infrastructure, green and ecological systems, and the water system.

These design interventions are not new and have been done abroad in cities such as Rotterdam, Hamburg or Stockholm. If we could add to these the redesign of roofs and gardens of industrial and residential estates and turn these into green roofs and rain gardens, the city would start to operate as a huge sponge.

When it rains, the city absorbs the huge amounts of water and releases it slowly to the creek and river system after the rain has gone. This way, green spaces and water spaces not only play an important role during and just after a cyclone, but they then add quality to people’s immediate living environment.

And maybe the best of all this: the bill Debbie and other natural disasters would present to government, industries and insurers could be much lower.

Rob Roggema, Professor of Sustainable Urban Environments, University of Technology Sydney

This article was originally published on The Conversation. Read the original article.

See Google’s Absolutely Stunning New Headquarters Design


TIME

Google has unveiled its ambitious new plans for a sprawling, modern Googleplex. The new facility, being developed by architect Bjarke Ingels, features a series of glass, canopies the size of city blocks, new biking and walking paths and an emphasis on green space. Renowned designer Thomas Heatherwick is also involved in the project. Google hopes to complete the first stage of development by 2020, but the company will first have to win approval from Mountain View’s city council amid growing concern over Google’s control over the development of the community.

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New Look


Hi all. I have changed the appearance of the Blog and I think it does look a lot better. The main reason for the change was that the titles of posts had for some reason stopped appearing on the front page. I could find no way to correct the issue and thought a change of theme may work – it has. Having changed the theme, I do think the Blog appears much better overall.

The other small change is the Blog title – I have shortened it a little to just Random Thoughts. So not a great change – the larger title made the appearance of the Blog look just that little bit awful. Now we can’t have that lol.

I hope you find the new look helpful.

New Christmas tree design will remind of the real Christmas


Boss Creations, a new holiday décor company, has introduced the new "CHRIST-mas" Tree™, featuring the unique trait of a trunk in the shape of a wooden cross. Company owner Marsha Boggs says the tree was specifically designed to counter the "war on Christmas," reports Boss Creations in its press release.

"When I became a Christian a few years ago," says Boggs, "I was appalled by the secularization of the Christmas holiday. When retail stores started substituting ‘Happy Holidays’ for ‘Merry Christmas,’ and schools began calling their Christmas programs ‘Winter Plays,’ it all seemed ridiculous to me. That’s why we have created products that remind people what the Christmas season is really all about – the birth of Christ."

The "CHRIST-mas" Tree™ is size adjustable up to 7.5 foot tall to accommodate various ceiling sizes. Additionally, the company offers ornaments, wreaths and gift items all with Christian-based themes.

Legal fights over Christmas symbolism continue to create headlines such as a recent ban on religious songs in a New Jersey school district where the federal appeal judges noted "such songs were once common in public schools, but times have changed." Lawsuits regarding Christmas trees being taken down from public buildings have sparked anger across the country. Boggs says Boss Creations’ mission is to uphold the traditional meaning of the Christmas season, and from their sales, the company will be supporting two non-profit organizations that work as advocates for religious freedom.

A portion of the proceeds of all "CHRIST-mas" Tree™ sales will go to support the American Center of Law & Justice, an organization recently hailed by BusinessWeek as "the leading advocacy group for religious freedom," as well as to the Liberty Counsel, a nonprofit litigation, education and policy organization dedicated to advancing religious freedom, the sanctity of human life and the traditional family.

Report from the Christian Telegraph