The queue of lorries at the Bulgarian-Turkish border resulting from the dispute between the two countries over truck transit permits reached about 15km on the morning of February 12 2014, public broadcaster Bulgarian National Television said.
Hauliers involved in protests against the situation said that they were considering a full blockade of the Turkish border, allowing no vehicles to pass if there was no solution from the Turkish authorities.
Turkey took reciprocal action at the end of January after Bulgaria issued only a fraction of the agreed number of permits for truck transit.
Lorries have been held up at the border for up to 12 days.
Small companies have been staging the protest for several days, barring the passage of lorries but allowing buses and passenger cars to pass.
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