<s>
Destination	B-Algorithm
dispatch	I-Algorithm
is	O
an	O
optimization	O
technique	O
used	O
for	O
multi-elevator	O
installations	O
,	O
in	O
which	O
groups	O
of	O
passengers	O
heading	O
to	O
the	O
same	O
destinations	O
use	O
the	O
same	O
elevators	O
,	O
thereby	O
reducing	O
waiting	O
and	O
travel	O
times	O
.	O
</s>
<s>
Using	O
destination	B-Algorithm
dispatch	I-Algorithm
,	O
passengers	O
request	O
travel	O
to	O
a	O
particular	O
floor	O
using	O
a	O
keypad	B-Device
,	O
touch	B-Device
screen	I-Device
,	O
or	O
proximity	O
card	O
room-key	O
prior	O
in	O
the	O
lobby	O
and	O
are	O
immediately	O
directed	O
to	O
an	O
appropriate	O
elevator	O
car	O
.	O
</s>
<s>
The	O
smooth	O
operation	O
of	O
a	O
destination	B-Algorithm
dispatch	I-Algorithm
system	O
depends	O
upon	O
each	O
passenger	O
indicating	O
their	O
destination	O
intention	O
separately	O
.	O
</s>
<s>
This	O
situation	O
is	O
handled	O
by	O
two	O
solutions	O
,	O
a	O
load	O
vane	O
sensor	O
on	O
the	O
elevator	O
,	O
or	O
a	O
group	O
function	O
button	O
on	O
the	O
keypad	B-Device
.	O
</s>
