An apparatus, comprising: a first sensor to detect traffic approaching an intersection from a first direction; a second sensor to detect traffic approaching the intersection from a second direction different than the first direction; a first display panel to: face toward the first direction; generate a first warning signal; and generate a second warning signal, the first warning signal associated with a higher warning level than the second warning signal; and a second display panel to: face toward the second direction; generate the first warning signal; and generate the second warning signal; a database to store a relationship between the first and second display panels and the first and second sensors; and processor circuitry to control operation of the first and second display panels based on the relationship, wherein the relationship is to cause the first display panel to generate the first warning signal in response to inputs from the first and second sensors indicating traffic approaching the intersection from the second direction is detected concurrently with traffic approaching the intersection from the first direction detected, and to generate the second warning signal in response to the inputs indicating traffic approaching the intersection from the second direction is detected concurrently with traffic approaching the intersection from the first direction not being detected, and wherein the relationship is to cause the second display panel to generate the first warning signal in response to the first and second sensors indicating traffic approaching the intersection from the first direction is detected concurrently with traffic approaching the intersection from the second direction detected, and to generate the second warning signal in response to the first and second sensor indicating traffic approaching the intersection from the first direction is detected concurrently with traffic approaching the intersection from the second direction not being detected. a first sensor to detect traffic approaching an intersection from a first direction; a second sensor to detect traffic approaching the intersection from a second direction different than the first direction; a first display panel to: face toward the first direction; generate a first warning signal; and generate a second warning signal, the first warning signal associated with a higher warning level than the second warning signal; and face toward the first direction; generate a first warning signal; and generate a second warning signal, the first warning signal associated with a higher warning level than the second warning signal; and a second display panel to: face toward the second direction; generate the first warning signal; and generate the second warning signal; face toward the second direction; generate the first warning signal; and generate the second warning signal; a database to store a relationship between the first and second display panels and the first and second sensors; and processor circuitry to control operation of the first and second display panels based on the relationship, wherein the relationship is to cause the first display panel to generate the first warning signal in response to inputs from the first and second sensors indicating traffic approaching the intersection from the second direction is detected concurrently with traffic approaching the intersection from the first direction detected, and to generate the second warning signal in response to the inputs indicating traffic approaching the intersection from the second direction is detected concurrently with traffic approaching the intersection from the first direction not being detected, and wherein the relationship is to cause the second display panel to generate the first warning signal in response to the first and second sensors indicating traffic approaching the intersection from the first direction is detected concurrently with traffic approaching the intersection from the second direction detected, and to generate the second warning signal in response to the first and second sensor indicating traffic approaching the intersection from the first direction is detected concurrently with traffic approaching the intersection from the second direction not being detected.