Using the same color for blinker and brake is asinine. You have to wait for it to blink, to know if they are turning or braking. Then decipher if its in pairs (tapping brakes) or just one side (blinker). Peripheral vision also comes into play for blind sides.
Amber Yellow has clear intent.
RED BRAKE
Yellow TURN.
White Reverse.
Saving money (pennies) should not jeopardize safety.