regex - replacing tabs with single tab in sed -

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i want replace multiple tabs single tab sed. trying use

sed 's:\t+:\t:' .\text.csv > newtext.csv

but doesn't seem work

if open in sublime , replace regex \t+ \t works properly

what wrong sed?

also, if replace tabs comma 

sed 's:\t\t*:,:g' text.csv > newtext.csv

i kind of line

264262360,20030826,200308,2003,2003.6466,bus,employer,,,,,,bus,,, ,,,,,,,,,,0,051,051,05,1,3.4,12,2,12,5.24866163479182,1

you can use tr replace multiple tabs single one:

tr -s '\t' '\t' < inputfile > outfile

the -s option squeezes repeats:

-s, --squeeze-repeats

      replace each input sequence of repeated character       listed in set1 single occurrence of character

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