| CPC B62J 50/25 (2020.02) [F21S 9/02 (2013.01); F21S 43/14 (2018.01); F21S 43/237 (2018.01); F21V 23/0464 (2013.01); F21W 2107/10 (2018.01)] | 18 Claims |

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1. An apparatus for mounting on a vehicle, wherein the apparatus is further for alerting an oncoming vehicle operator as to the presence of a certain number of additional vehicles behind the vehicle, the apparatus comprising:
a body including an upward-facing side and an rearward-facing side;
a processor configured to receive power from a battery;
a display including a first group of segments and a second group of segments, wherein each of the segments comprises an LED, wherein the display is configured to receive power from the battery and to receive signals from the processor, wherein the signals dynamically control an illumination pattern of the segments, wherein the segments are mounted on the circuit board, wherein the first group of segments is configured to illuminate patterns of the segments corresponding to different numbers, wherein the second group of segments is configured to illuminate a pattern of the segments corresponding to at least one word;
and
a user interface, wherein the user interface communicates with the processor and is configured to control the display;
the user interface comprises a number-adjusting mechanism configured to cause the processor to communicate signals to the display to adjust the pattern displayed on the first group of segments such that an adjusted number is displayed;
the number-adjusting mechanism comprises an increment button and a decrement button.
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