Protesters block a semi-tractor truck from entering San Luis Rio Colorado, Son. during a protest of summer electricity rates in Mexico Tuesday afternoon. An estimated 300 people gathered in the vehicle lanes between San Luis, Az., and neighboring San Luis Rio Colorado, Son., preventing motorists from traveling between the two countries. RYAN BRENNECKE/THE SUN

Protesters block a semi-tractor truck from entering San Luis Rio Colorado, Son. during a protest of summer electricity rates in Mexico Tuesday afternoon. An estimated 300 people gathered in the vehicle lanes between San Luis, Az., and neighboring San Luis Rio Colorado, Son., preventing motorists from traveling between the two countries. RYAN BRENNECKE/THE SUN