frog detector

i have problem there pond next driveway. come home @ night , many times there frogs on driveway. many times difficult spot tiny , there debris. thought have detector made of 2 lasers or ir led's flashing @ fast pace , @ different rates. if placed next each other , made shine down length of driveway 10 20 feet detect direction frog goes. in program can take information , keep track of if there frog still on driveway. program can able diagnose problem monitoring how long sensor has been blocked if falls in way of beams can alert of problem. wanted post not sure if best way go or how program it.

do want rid of frogs, or want keep them alive ?
i don't know how laser or ir leds can helpful. frogs cold-blooded, ir motion detector not work.

is there bio solution this, frog repellent or ?
you make air bubbles in pond simple air pump. reduces flies , frogs.
or make barrier small fence or salt. dogs, frogs hate walk on salt.

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