Those are signals for how to manouver within aerodrome:
Line with dots on the ends (dumb-bell): Movements of aeroplanes and gliders on the ground shall be confined to paved, metalled or similar hard surfaces
A horizontal red square panel with one yellow diagonal: Indicates that owing to the bad state of the manoeuvring area, or for any other reason, special precautions must be observed in approaching to land or in landing
T: indicates the direction to be used by aircraft for landing and take-off, which shall be in a direction parallel to the shaft of the T towards the cross arm
Right-hand arrow with two crossing lines is actually two different markings combined:
Right-hand arrow: indicates that turns are to be made to the right before landing and after take-off
Double white cross: indicates that the aerodrome is being used by gliders and that glider flights are being performed
Writings - Misc 
Line with dots on the ends (dumb-bell): Movements of aeroplanes and gliders on the ground shall be confined to paved, metalled or similar hard surfaces
A horizontal red square panel with one yellow diagonal: Indicates that owing to the bad state of the manoeuvring area, or for any other reason, special precautions must be observed in approaching to land or in landing
T: indicates the direction to be used by aircraft for landing and take-off, which shall be in a direction parallel to the shaft of the T towards the cross arm
Right-hand arrow with two crossing lines is actually two different markings combined:
Right-hand arrow: indicates that turns are to be made to the right before landing and after take-off
Double white cross: indicates that the aerodrome is being used by gliders and that glider flights are being performed