in the form of piezo electric, pneumatic tubes, infra-red, radar and bluetooth etc. these automatic counters provide reasonably high quality data and they have their own limitations. most of these are used for mid-block counts and have limitations when it comes to intersection counts in urban planning...
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introduction of sequential circuits synchronous sequential circuits asynchronous sequential circuits difference between combinational and sequential circuit rtl (register transfer level) design vs sequential logic design difference between synchronous and asynchronous sequential circuits register and counters...