just found this in this forum
"
The A/Analog ports on an Arduino are Analog inputs on most Arduino's. The name analogWrite() is still pretty confusing but it applies to the PWM capable pins. Really whished they called it pwmWrite()." by septillon
ok, then i have to modify usage of pins after checking whether 2 pins of A0..A7 can receive the signals from light-sensors
which act to count the cars as described earlier in this thread
hope you understand my bad english writing..did not find all translations in german-english-dictionary, sorry !