Short answer

Designers must account for age-related changes in visual attention and cognitive processing when designing pedestrian environments and traffic systems.

Field: Human Factors
Source: BMC Geriatrics (2015)
Method: Observational study using virtual reality simulation and eye/head tracking.
Sample: 36 participants (18 younger, 18 older)
Evidence: Moderate effect

Older pedestrians' visual attention is disproportionately directed towards the ground, likely to aid stepping, at the expense of monitoring oncoming traffic, leading to less secure street crossing behaviour. This human factors research insight is drawn from a 2015 study published in BMC Geriatrics. Using Observational study using virtual reality simulation and eye/head tracking. with 36 participants (18 younger, 18 older), researchers explored how this design variable affects real-world outcomes. The key design takeaway: Designers must account for age-related changes in visual attention and cognitive processing when designing pedestrian environments and traffic systems.

Study

Human FactorsHigh ImpactModerate effect

Older pedestrians prioritize ground-gaze over traffic-gaze, increasing risk

BMC Geriatrics · 2015

Key Findings

01Older pedestrians exhibited less secure street crossing behaviour compared to younger pedestrians.
02Older pedestrians spent more time looking at the ground and less time looking at the opposite side of the street.
03Both age groups based crossing decisions primarily on vehicle distance rather than speed.
04Older pedestrians tended to overestimate their walking speed and struggled to adapt it to traffic conditions.

Application

Design takeaway

Designers must account for age-related changes in visual attention and cognitive processing when designing pedestrian environments and traffic systems.

How to apply

When designing public spaces, consider the visual scanning patterns of older adults and provide clear, unobstructed views of traffic. Implement auditory or haptic cues that alert pedestrians to approaching vehicles, supplementing visual information.

Project actions

01Investigate how different visual impairments affect pedestrian behaviour.
02Explore how auditory cues can improve pedestrian safety for older adults.

Method & Evidence

AimTo investigate age-related differences in street crossing behaviour, specifically examining eye and head movements, safe crossing rates, and crash occurrences in younger versus older pedestrians using a virtual reality simulation.

MethodObservational study using virtual reality simulation and eye/head tracking.

Procedure18 younger and 18 older healthy adults participated in a virtual reality simulation of street crossing. Their eye and head movements, number of safe crossings, virtual crashes, and missed crossing opportunities were recorded and analyzed using non-parametric tests.

Sample36 participants (18 younger, 18 older)

ContextUrban pedestrian safety, human-computer interaction (virtual reality), gerontology.

Variables

IVAge group (younger vs. older)

DVNumber of safe crossings, virtual crashes, missed crossing opportunities, eye movement patterns (e.g., proportion of time looking at ground vs. traffic), head movement patterns.

CVVirtual reality setting, traffic conditions (distance/speed of vehicles), health status (healthy participants).

Strengths & Limitations

Strengths

+Utilized objective measures (eye/head tracking) for behavioural analysis.
+Employed virtual reality for safe and controlled testing of a potentially dangerous scenario.

Limitations

A simplified VR environment might not capture the full complexity of real-world traffic and pedestrian interactions. The study focused on healthy older adults, so findings may differ for those with specific health conditions.

Reliability & validity

Reliability is supported by the use of standardized VR and tracking equipment. Validity is enhanced by comparing objective behavioural data with outcome measures (crashes, safe crossings), though the VR context introduces some ecological validity limitations.

Think critically

To what extent can virtual reality accurately predict real-world pedestrian behaviour, and what are the ethical considerations of using such simulations for safety research?

Design Principles

"Design for diverse user capabilities, recognizing that visual attention and cognitive load vary significantly with age."

This highlights a critical human factor in pedestrian safety, particularly for aging populations. Designers of urban environments, traffic management systems, and even personal mobility aids must consider these age-related visual and cognitive shifts to create safer, more accessible spaces.

What This Means for Your Design

Older people are more likely to have accidents when crossing the street because they look down at their feet more and don't watch the cars as much.

How to use in your project

1.Use the findings to justify user research into the visual attention patterns of your target demographic.
2.If designing a product for outdoor use, consider how users might divide their attention between the product and their surroundings, especially if they are older.

Add to My Project

Quick Cite

Paragraph starter

The study by Zito et al. (2015) revealed that older pedestrians exhibit less secure street crossing behaviour, characterized by a greater focus on the ground and less attention to oncoming traffic. This visual attention shift, likely to aid precise stepping movements, compromises their ability to effectively assess traffic speed and distance, leading to increased risk. This highlights the critical need for designers to consider age-related changes in visual scanning and cognitive processing when developing urban infrastructure and traffic management systems to ensure user safety and accessibility.

Source

BMC Geriatrics

Street crossing behavior in younger and older pedestrians: an eye- and head-tracking study

journal · 2015

View source

Questions About This Research

What does the research say about older pedestrians prioritize ground-gaze over traffic-gaze, increasing risk?: Designers must account for age-related changes in visual attention and cognitive processing when designing pedestrian environments and traffic systems. Evidence: BMC Geriatrics (2015).
Why does "Older pedestrians prioritize ground-gaze over traffic-gaze, increasing risk" matter for design?: This highlights a critical human factor in pedestrian safety, particularly for aging populations. Designers of urban environments, traffic management systems, and even personal mobility aids must consider these age-related visual and cognitive shifts to create safer, more accessible spaces.
How can designers apply this research?: Designers must account for age-related changes in visual attention and cognitive processing when designing pedestrian environments and traffic systems.
What were the main findings?: Older pedestrians exhibited less secure street crossing behaviour compared to younger pedestrians.. Older pedestrians spent more time looking at the ground and less time looking at the opposite side of the street.. Both age groups based crossing decisions primarily on vehicle distance rather than speed.. Older pedestrians tended to overestimate their walking speed and struggled to adapt it to traffic conditions.
What research method was used?: Observational study using virtual reality simulation and eye/head tracking. with 36 participants (18 younger, 18 older).
How strong is the evidence?: Evidence strength is rated Moderate effect, based on a 2015 journal from BMC Geriatrics.
What should I do differently in my next project?: When designing public spaces, consider the visual scanning patterns of older adults and provide clear, unobstructed views of traffic. Implement auditory or haptic cues that alert pedestrians to approaching vehicles, supplementing visual information.
What are the limitations?: Virtual reality simulation may not perfectly replicate real-world complexities; sample size is relatively small; only healthy older adults were studied, not those with significant cognitive decline.