Arabic term (edited): ���

Whichever way you put it, the main clause does not seem to fit with the subordinate clause. Neither in structure and tense, nor in meaning. If you assume the sentence was not transcribed correctly into your source text, we may assume the following original structure:

Past:
ولئن اذعن السائق للاشارة الامنية وتوقف على حافة الطريق لكان المحققين تضاعفت شكوكهم

Present (clumsy):
ولئن اذعن السائق للاشارة الامنية وتوقف على حافة الطريق فإن المحققين تتضاعف شكوكهم

I think that these versions are correct syntactically, but the semantics are still difficult. The premise would be that obeying the authorities' signal to stop represents suspicious activity!

Here is one way where this would make more sense:
ولولا أن أذعن السائق للإشارة الأمنية وتوقف على حافة الطريق لكان المحققين تضاعفت شكوكهم

i.e.: had he not obeyed the authorities' signal and stopped on the roadside, the investigators' doubts would have increased.

It depends on the nature of the source documents that you have and the control has on the text, whether you have some flexibility in this translation or not. If there is no flexibility, I suggest transcribing the error into a literal translation, with a translator's note explaining the issue.

Of course as far as the meaning of لئن, Mona's answer is correct. But with this quality, who knows if the original word might have been لأن (because), yest the grammar would be wrong, but you would still have the same issues as above.

Goodluck, this is a tough one.


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Note added at 4 hrs 12 mins (2004-12-08 04:32:12 GMT)
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Second paragraph from the end: ...and the control you client has over the text ...

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Note added at 4 hrs 26 mins (2004-12-08 04:46:15 GMT)
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Based on the additional information you posted لئن seems wrong, the sentence should have started as follows:

لو أن السائق أذعن

In this case, the main clause would be correct as is.

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Note added at 4 hrs 27 mins (2004-12-08 04:46:36 GMT)
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Sorry: ولو أن