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Reply on: zlomok #215198:
Teoreticky by sa cez GPS dala zmerat priemerna rychlost v elektrickovom tuneli (porovnanie vzdialenosti medzi bodom zaciatkom a koncom merania - pozor, nie vzdusnou ciarou! - a casu za ktory to preslo). Ale urcite nie takym systemom ze hura zapnem nejaku nahodnu aplikaciu a idem merat 
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2) better yes (you ought to get an additional reduced price ticket - it is valid for 3 hours if dedicated for luggage),
3) you are eligible to use a reduced travel ticket in a case if you are 62 and older,
4) drivers do not sell any tickets within intra-urban public transport. Since 11/2015, information attached on ticket machines are multilingual - you will surely understand everything stated within.