Designed to significantly reduce vehicle speeds to 2-5 mph, speed bumps are shorter and steeper traffic calming devices, typically measuring 3-6 inches in height and 3-5 feet in length1. These features are often constructed from recyclable rubber, plastic, or metal, and are painted black and yellow for increased visibility1. Speed bumps are most effective in areas with low traffic volumes and speed limits, such as:

• Commercial and industrial zones

• Parks and residential areas

• School zones and sporting event venues

• Parking lots

The installation cost for a speed bump typically ranges from $1,000 to $1,500, making them a cost-effective solution for improving safety in specific locations1.

Longer and more gradual than their counterparts, speed humps typically measure 10-15 feet in length and are designed to reduce vehicle speeds to 10-15 mph. These traffic calming devices are commonly constructed from asphalt or rubber and are frequently installed on public roads, in residential areas, school zones, and near crosswalks1. The installation cost for a speed hump ranges from $2,000 to $5,000, depending on size and material, making them a more substantial investment for traffic management1. Their gentler incline allows for a smoother transition, making them suitable for areas with slightly higher speed limits compared to speed bumps.

Both speed bumps and humps are effective at reducing vehicle speeds, but their suitability depends on the specific location and desired speed reduction. They are not recommended for curved highways or roads with slopes greater than 8%1. Speed bumps are ideal for very low-speed areas like parking lots, while speed humps are better suited for moderate-speed areas such as residential streets. It's important to note that driving over these devices at high speeds can potentially damage vehicles, particularly shock absorbers, springs, and tires1. This risk of damage serves as an additional deterrent for speeding, contributing to the overall effectiveness of these traffic calming measures.

Installing speed bumps on private roads in the United States is generally permissible, but regulations vary by location. Before proceeding with installation, property owners should:

• Check local ordinances and obtain necessary permits from traffic or engineering departments

• Review homeowner's association rules, if applicable

• Consider professional installation for proper placement and regulatory compliance

While DIY kits are available, professional installation ensures safety and adherence to local regulations. It's crucial to research thoroughly and understand the legal and safety implications before installing speed bumps on private roads.1