Here's the whole deal: Under NAFTA, the US has to allow Mexican trucks and drivers to cross into the US, and Mexico has to do the same for US trucks
and drivers. The caveat is that, also under NAFTA, foreign trucks/drivers entering must adhere to regulations equivalent (not equal) to those of the
country they are entering.
Mexico has implemented no regulations that come near to those endured by US drivers.
Under USDOT regulations, drug use is not only discouraged, it is practically impossible. All drivers are required to take a drug test upon
employment/lease with a company, any time there is a DOT-reportable accident,whenever there is 'reasonable suspicion',and also at random times
equaling a minimum 10% of the drivers at a company per year. In addition, the alcohol level that qualifies one as DUI is dropped from 0.8% to 0.4% for
anyone possessing a CDL (even if in their personal vehicle). And also in addition, a trucker with any
drug-related offense has an extremely
difficult time even getting a job.
American drivers are tightly regulated as to how long they can drive. A driver must stop driving after driving for more than 11 hours, or after being
awake for more than 14 hours, since their last rest period which must be ten hours or more. They may not drive more than 70 hours in any consecutive
8-day period. One exception is that this 70-hour rule is reset if the driver takes a total of 34 consecutive hours off-duty.
Trucks must be kept in optimum operating condition at all times. Tickets are written for things like a clearance light not working, a low tire, an air
leak, or even an air hose routed too close to certain items. These tickets are now handled through a national database, and drivers with too many
tickets are targeted for inspection frequently.
US drivers must undergo a complete DOT physical every two years and keep the medical records in their truck for review by any DOT-certified LEO at any
time. If any problems are detected, this time may be reduced to as low as 3-months or the driver can be disqualified form driving completely.
HAZMAT regulations carry such stiff fines and penalties that many drivers will not even haul HAZMAT any more. In addition, HAZMAT certification
requires a specialized test that is given during every license renewal, more often than not given to all new drivers at the company level, and also
requires a background check (paid for by the driver).
Mexican drivers still use stimulants to maintain alertness more often than not; their trucks are often in disrepair; they tend to drive for extended
periods without stopping, and there are no medical requirements or log books required in Mexico. This is from personal chats with Mexican drivers (I
drove OTR for 8 years until recently).
The NAFTA Super Highway project was abandoned while Bush was in office, over a public outcry against it. Obama has expressed many times that he wants
to see it restarted. When complete,the original plans had the Mexican Customs facility in Oklahoma City, OK!
In general, this is the worst plan that has come out of DC in my lifetime. It compromises national security, encourages crime, compromises the safety
of anyone traveling US roads, has no reciprocity (US drivers simply do not want to drive into Mexico due to the corruption and dangers there), will
lower US wages (Mexican drivers make a fraction of what US drivers do), and reduce US jobs (since Mexican drivers do not obey the US regulations like
US drivers are forced to do).
So far as the Teamsters, that is one Union that actually does do some good. I would gladly pay dues to drive for a Teamsters company, because my wages
would be much much higher, and my job would be much more secure (a non-Union driver can be fired for failing to make a delivery which is illegal, and
can also be fired for breaking the law by making that delivery on time - damned if you do, damned if you don't).