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Crash Prevention & Safety > Intersection Collision Warning, Crash Prevention & Safety > Intersection Collision Warning


Intersection collision warning systems are designed to detect and warn drivers of approaching traffic at high-speed intersections., Intersection collision warning systems use sensors to monitor traffic approaching dangerous intersections and warn vehicles of approaching cross traffic, via roadside or in-vehicle signage.


Obtain working prototypes of CV applications from the USDOT’s Open Source Application Data Portal (OSADP) to prevent time spent doing duplicative software development

Include technical, operations, and legal personnel in stakeholder meetings to address the requirements of the CV deployment and ensure that participants' privacy is being maintained

During system testing, CV Pilot sites discover the importance of having expertise in detecting and mitigating interferences with radio frequency and GPS signals(12/13/2018)

Refine institutional arrangements when deploying connected vehicle technology to outline the expectations of partners in terms of service, outcomes and reporting.(12/13/2018)

Refine proper antenna placement on connected vehicles (particularly commercial vehicles) to reduce DSRC ‘shadow’ areas where DSRC signal is degraded.(12/13/2018)

Connected vehicle deployers are encouraged to utilize multi-vendor outsourcing and to source suppliers early to create a collaborative environment that enables as much parallel work as possible.(12/13/2018)

Connected vehicle deployers should assess field equipment and organizational capabilities that will be needed to support core CV components.(12/13/2018)

Specify interoperability testing requirements and steps as part of the connected vehicle device requirements prior to starting multiple rounds of testing, feedback, reset, and retesting.(September 2015)

Use a modular project structure and focus on high priority objectives and project components when deploying complex ITS projects such as those with connected vehicle technologies. (September 2015)

Clearly communicate requirements and testing procedures to connected vehicle device developers, and allow for industry input and iteration for less mature devices. (September 2015)

Develop a focused outreach plan that identifies all stakeholders, the message appropriate for each stakeholder and the method in which you will reach the stakeholders when embarking on a connected vehicle project.(September 2015)

Conduct a data collection pilot test to validate end-to-end data acquisition, transfer, processing, and quality assessment processes.(September 2015)

Include driver age, time of day, and intersection characteristics in the design of red light violation algorithms and warning systems, and their field operational tests.(March 2006)

Implement infrastructure-based collision avoidance technology to mitigate risks at crash prone intersections.(September 2003)

Implement infrastructure-based collision avoidance technology to mitigate risks at crash prone intersections.(September 2003)

Cooperative Intersection Collision Avoidance Systems improve safety and offer an alternative to traffic signals at rural intersections(October 2010)

In-vehicle adaptive stop display results in more compliant behavior compared to the traditional stop sign.(07/30/2015)

Dynamic roadside warning systems that alert drivers of opposing traffic at rural intersections can decrease roll-throughs up to 22 percent.(February 2014)

Most professional truck drivers interviewed in Ohio and California expressed favorable views of on-board connected vehicle safety applications installed on Class 8 commercial vehicles.(01/31/2014)

"Vehicle Entering When Flashing" Signs at stop-controlled intersections in North Carolina yield a 7 percent reduction in crashes. (11/14/2012)

Cooperative Intersection Collision Avoidance Systems improve safety and offer an alternative to traffic signals at rural intersections(October 2010)

Deployment of a dilemma zone protection system reduced the maximum length of the dilemma zone by 30 percent at a rural intersection in Maryland.(July 2017)

Deployment of a dilemma zone protection system reduced the maximum length of the dilemma zone by 30 percent at a rural intersection in Maryland.(July 2017)

Intelligent advanced warnings of end-of-green at signalized intersections led to more stopping and milder deceleration compared to no warnings.(03/01/2014)

In-vehicle warning systems that provide drivers with auditory alerts of approaching red-light running vehicles can reduce collisions by 75 percent.(02/21/2014)

Wrong-way driver thermal detection system in Phoenix addressed 33 near-incidents in first six months of operation.(8/8/2018)

Crash-conflict models suggests a 50 percent AV market penetration rate can reduce crashes at four-legged signalized intersections by 24 percent.(7-11 January 2018)

Rapid deployment of DSRC for connected vehicles can save thousands of lives, regardless of whether a later transition to C-V2X proves advantageous.(12/12/2017)

The annual number of near-crash events at test sites equipped with intersection collision warning systems in Minnesota decreased by approximately 26 percent.(October 2017)

Rural Intersection Active Warning System trialed in New Zealand demonstrates ability to slow down motorists, resulting in a 71 percent decrease in crashes.(08/05/207)

FHWA national study finds intersection conflict warning systems reduce total crashes by 27 percent for two-lane at two-lane intersections(06/01/2016)

91 percent of volunteer drivers that tested V2V communications safety features indicated they would like to have these technologies on their personal vehicle.(05/21/2012)

Vehicle-to-vehicle applications can have positive benefit-to-cost ratios at fleet penetration rates above 6.1 percent.(04/29/2010)

In Hennepin County, MN, an intersection warning system reduced traffic conflicts and received very positive feedback from the public.(2010)

In Hennepin County, MN, a public survey reported nearly 80 percent of respondents had improved awareness of approaching traffic after the installation of the intersection warning system.(2010)

Initial research suggests that most drivers will respond to intersection collision warning systems and slow or stop appropriately.(22-26 January 2006)

Intersection collision avoidance systems deployed at intersections with high crash frequencies or high rates of severe injury are projected to recoup initial costs within one year, through a reduction in crashes.(September 2003)

In a rural area of Virginia, a collision countermeasure system installed on a two-way stop-controlled intersection reduced vehicle speeds by 2.4 mi/hr, and increased the average projected time to collision from 2.5 to 3.5 seconds.(1-4 May 2000)

Cooperative Intersection Collision Avoidance System program costs $5,222,635 over six years in Minnesota(October 2010)

Intersection conflict warning systems that use vehicle detection loops, warning signs and flashers cost $21,200 to $28,000 per intersection.(11/14/2012)

DSRC Roadside Unit(10/23/2018)

In Atlanta, the cost to purchase, install, configure, and support 600 RSUs for DSRC SPaT/MAP applications was estimated at $2,490,000 (FY2018).(10/23/2018)

Onboard Unit (OBU)(10/23/2018)

Onboard Unit (OBU)(10/23/2018)

Cellular-V2X (C-V2X) communication modules that use wireless wide-area network (WWAN) cellular modems to broadcast and receive basic safety messages (BSM) can be supplied to automobile manufacturers for less than $222 per unit.(February 2018)

Costs to deploy Intersection Collision Warning Systems range from $9,000 to $142,500 depending on number of lanes and if systems are post or overhead mounted.(06/01/2016)

Total potential connected vehicle DSRC deployment costs at signalized intersections needing controller upgrades may cost on average $51,600 per site(06/27/2014)

With inter-vehicle communications available as a standard feature on new vehicles by 2020, the cost to implement a V2V solution in Europe (EU-25) was estimated at 359 million Euros per annum assuming a fleet penetration rate of 6.1 percent.(04/29/2010)

For six types of intersection collision warning scenarios, the cost of the design, equipment, and installation ranged from $47,230 to $73,320 per intersection.(September 2003)