- March 24, 2025
- Perspectives
Securing Public Spaces: How Vehicular Barriers and Environmental Design Enhance Safety
Shannon Ahartz, PE
Civil Engineer
Jeremiah Kamerer, PE
Civil Engineer
Joe Podegracz, PE, PTOE
Civil Engineer
Daniel Wolf, EI
Civil Analyst
Vehicular barriers act as physical obstructions along the perimeter of roads, buildings, or key infrastructure, typically protecting pedestrians and/or buildings from errant vehicles. These barriers come in many different varieties, such as bollards, gates, walls, and even streetscape furniture. The most widely used protection device—crash-rated bollards—are vertical protection posts that act as a physical and visual barrier separating vehicle and pedestrian traffic while allowing seamless pedestrian access. As a critical part of providing physical security, these safety measures are particularly useful for projects involving street protection and pedestrian plazas, especially in the wake of recent security incidents in New Orleans and Munich, Germany.
Whether they are used by government agencies, municipalities, commercial development groups, or data centers and warehouses, bollards and other barriers can help address your safety concerns or mitigate concerns before they arise. With that in mind, read more to hear from our experts on the science of site security, the use and benefits, and other safety measures to consider.
Bollards 101: Use Cases and Benefits
![Bollards are a critical safety measure for a variety of uses, including roadway protection and pedestrian plazas.]](https://www.kimley-horn.com/wp-content/uploads/2025/03/Bollards@Bellagio_khmedium-min.jpg)
Bollards are a critical safety measure for a variety of uses, including roadway protection and pedestrian plazas.
With persistently high numbers of vehicular attacks on pedestrians, there is a need to protect locations that attract large public gatherings. Each site has its unique geometry and layout, and assessing access points and surrounding roadways is critical to developing a secured environment. One of the first steps in conducting risk, vulnerability, and mitigation assessments is to determine the Design Basis Threat. For instance, consider electric vehicles, which are heavier than typical personally occupied vehicles and can accelerate more quickly. It is essential to calculate and consider a vehicle’s run-up distance and maximum speed in these assessments, and update models accordingly.
The science of bollards uses vector dynamics to anticipate the largest and/or fastest-moving vehicle that could hit the bollard and how much penetration past the bollard the potential impact would be to pedestrians or assets nearby. The larger a vehicle is and the faster it travels, the more force the bollard must withstand. The underground foundation of bollards is designed to absorb and dissipate the impact, stopping errant vehicles before they can cause injury.
Bollards are a critical component of perimeter security with their ability to stop or reduce the damage to pedestrians and infrastructure from a car going off-road. With this added layer of physical security that makes unauthorized entry difficult, bollards enhance overall security and resilience of the environment. They can protect a variety of critical assets, including:
Aviation perimeters
Storefronts
Streets, particularly pedestrian plazas
Public spaces and parks
Healthcare facilities
Educational institutions
In areas with high pedestrian access, such as a farmer’s market, bollards are a reliable safety method with their ability to retract and allow pedestrians to circulate freely. For large-scale events and activities, such as the FIFA World Cup or the Olympics, there also is a need to provide security due to the surplus of people and their need to flow freely in a substantial public space.
The potential cost of not having bollards or other safety measures far outweighs the cost of installation. Take, for example, the regularity in which convenience stores are targeted with “crash-and-grab” robberies. Marijuana dispensaries, gun stores, and ATMs frequently face the same issues. But with bollards in place, a vehicle would have a reduced chance of exiting the road and crashing into a storefront, leading to fewer injuries and fatalities and less loss from inventory or structural damage.
A Holistic Approach to Improving Safety
With the benefits of bollards in mind, this protection measure may not always be the right fit for your safety needs and concerns. It is important to take a comprehensive approach and keep other safety measures in mind. Bollards may also not be the right choice for your aesthetic needs, and you may need to collaborate with others to align safety with a more stylistic vision.
There are no “one-size-fits-all solutions” in perimeter security, and as a result, there are many crash-rated devices and methods to consider, including strategies from Crime Prevention Through Environmental Design (CPTED):
Crash barriers
Crash gates
Vehicle barriers, such as wedge barriers
Walls
Reinforced planters
Boulderscaping
Trees
Reinforced benches, art displays, seat walls
Looking to the Future of Vehicular Barriers
In recent years, there have been industry-wide conversations to move toward a standard code or policy for bollards and other protection methods. This would have potential insurance implications, as there could be reductions in insurance costs if entities that were targeted had bollards in place. While a hot topic at safety conferences, there is no current legislative activity to implement this at the state or federal level.
Whether you’re looking to implement bollards at your local government, municipality, commercial property, data center, or sports complex, these safety measures are critical to providing proactive security measures for people and assets.
About the Experts
Shannon Ahartz, PE
Shannon has more than 30 years of experience managing and designing infrastructure projects, with a focus on security features to protect pedestrians from errant vehicles. He excels at evaluating sites for vehicle threats. Notably, Shannon led a project installing more than 6,000 high-security bollards on Las Vegas Boulevard (The Strip), significantly enhancing pedestrian safety and securing key properties in the area.
Jeremiah Kamerer, PE, CPTED
Jeremiah is a partner in integrated site security design at Kimley-Horn, where he combines civil engineering, landscape architecture, and advanced security strategies to create safe, resilient, and well-designed spaces. With more than 24 years of experience, he has worked on a wide range of projects, from corporate campuses and schools to federal and local government facilities. Passionate about proactive security planning, Jeremiah helps clients design environments that enhance safety, reduce risk, and foster stronger communities.
Joe Podegracz, PE, PTOE
Joe has more than 17 years of civil engineering experience designing and managing multidisciplinary site security, safety, and transportation projects. Using his depth of roadway and civil site expertise, Joe brings a holistic approach to site safety assessments and vehicular barrier design, incorporating the latest technological advancements to ensure optimal safety and efficiency in all projects.
Daniel Wolf, EI
Daniel is a civil analyst specializing in site safety assessments and the design and implementation of vehicular barriers. Daniel’s proficiency in vehicular barrier design includes the strategic planning and placement of barriers to prevent accidental or deliberate vehicle incursions. He has worked on high-profile projects, including city centers, public events, and sensitive infrastructures, implementing solutions that blend safety with functionality and aesthetic considerations.