configuration- inductive loops - mixed traffic ( indian road conditions )- microcontrollers

hi,
In the context of a microcontroller based traffic light controller that
uses inductive loop to detect presence/speed etc of vehicles on the
indian roads, I am curious to know if a configuration of inductive
loop in the verical plane has been used for traffic monitoring/control
applications?, If not, how can it be used? Such an application can
potentially alleviate the installation/maintenance problems with buried
inductive loop based detectors.
I am considering using an 8/16 bit AVR based microcontroller for this
project.
Also, the traffic flow is expected to be heavily mixed, with scarce
lane discipline (perhaps even absent:P). Considering using the
inductive signature of vehicles to identify them (may need 32 bit ARM
then? )

(overhead) cable
_______________
| |
| |
| vehicle passes | <--- (vertically mounted side) cable
| through the loop |
|_______________|
EARTH ( part of loop )
google did not help with the configuration question. only provided info
on buried detectors.

thanks in advance
ananth

.

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