Automatic Headlight Brightness Switch Circuit

When you drive on the way most of time, you can see some drivers drive their vehicles with their powerful head lights.As a result of it we cant drive our vehicles because at that time we become blind,Some times it causes for various road accidents.So I have introduce a new circuit to switch your high beam to low beam automatically.when a vehicle comes in front of you automatically your head lights go to dim position.
Parts:
R1 5K 1/4W Resistor
R2, R3, R4 5K Pot
K1 Low Current 12V SPST Relay
K2 High Current 12V SPDT Relay
S1 SPST Switch
B1 Car Battery
MISC Case, wire, board, knobs for pots
Q1 NPN Phototransistor
Q2 2N3906 PNP Transistor

Note
1.S1 can on and off the circuit.
2. B1 is, certainly, in the car already.
3. Connection A goes to the high beam circuit, B goes to the headlight switch common and C connects to the low beam circuit.