Just do it naturally just as if you were doing your job
Do you think people will remove these signs by night ? no. So do it during day.
If you look natural, people will not see anything strange. Except if usually these signs are staying there during months
If someone ask you any question then say the truth : you are recycling wastes and that thanks to them you are going to save dinosaur juice and reject less CO2 in air
Denis.
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Save money & CO2 at home :
http://ecorenovator.org/
Created and managed by the creators of
http://ecomodder.com/ 
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Earth and health are priceless, so are kilotank and AT-PZEV
Best Mégane tank: 1268.9mi @ 77.847 MPG(US)
2008/06-2011/10 saving:
- 5725.5 kg CO2 (5342.6+382.9)
- Diesel / Money: 42.17% = 2446.25€ = 3357.26$
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megane :
thread -
kill switch.