Both the CDC and OSHA recommend using temporary partitions in vehicles to help slow the spread of COVID-19. It's important to be sure these are used appropriately to avoid issues.
Possible risks:
Hindering airbags (side curtain and seats) if the partition is rigid
Injury to occupant due to hitting a rigid/damaged partition
Unable to evacuate vehicle due to poor installation
Reduced driver visibility due to glare, reflection, poor cleaning
Communication difficulty between driver and passenger
To help mitigate these issues:
Use partitions made from appropriate materials
The material should be very transparent and flexible and not so thick that it cannot be easily cut with a tool to allow rapid evacuation. Examples are vinyl or a sheet of polyethylene. This flexible material also minimizes the risk associated with impacts, is not jagged if torn and does not shatter, and does not limit easy access to exits to evacuate
Polycarbonate and acrylic (plexiglass) can also be used as long as it is not rigid and too thick
Proper installation
It is best to use products specifically designed for this use instead of making homemade solutions
Install based on manufacturer's specifications
Use the least rigid means of attachment (so it can be easily removed if needed) and ensure it's in reach of occupants
Maintenance
Regularly check for tears, cracks, or breaks and replace if damaged
Keep the partition clean and sanitized
In summary:
Use a product designed for this purpose
Be sure installation does not hinder deploying of airbags and doesn't make it difficult to evacuate the vehicle
Use material that is flexible, does not shatter or produce sharp edges if broken
Use material that is transparent and produces as little glare as possible
Clean regularly and replace if it gets damaged
Do not use homemade partitions made form shower curtains, sheets of hard, thick plastic, or other material not specifically designed for this purpose
For more coronavirus safety tips and resources, visit our Coronavirus Safety blog.

