I personally believe that should should travel using public transit such as bus or train.
I have multiple reasons for this.
As we all know that people are encouraged to use public transit since it affects the enivornment less as well as it decrease congestion. If children are taught at very young age to use public transport it would be greate benefit inn future as we all know that fossil fuel will be extinct in two-three decades. Suppose teacher is travelling with the student in public transport their would be more chance of assistant available. Due to this, there will be more help to take care of children, if someone is with teacher all the time.
Secondly, I also think that it would be beneficial for children to grow some social etiquettes like how to be in line, how to give respect, when to leave the bus.
In conclusion, it will be more suitable for children to go on filed trip by public transit, as it will be helpful to them and environment also. I hope that parents will understand situation and take necessary decision. 
I  
personally
 believe that  
should should
 travel using  
public
 transit such as bus or train.
I have multiple reasons for this.
As we all know that  
people
  are encouraged
 to  
use
  public
 transit since it affects the  
enivornment
 less  
as
 well as it decrease congestion.  
If
  children
  are taught
 at  
very
 young age to  
use
  public
 transport it would be  
greate
 benefit inn future as we all know that fossil fuel will be extinct in two-three decades. Suppose teacher is travelling with the student in  
public
 transport their would be more chance of assistant available. Due to this, there will be more  
help
 to take care of  
children
, if someone is with teacher all the time. 
Secondly
, I  
also
  think
 that it would be beneficial for  
children
 to grow  
some
 social  
etiquettes
 like how to be in line, how to give respect, when to  
leave
 the bus. 
In conclusion
, it will be more suitable for  
children
 to go on filed trip by  
public
 transit, as it will be helpful to them and environment  
also
. I hope that parents will understand situation and take necessary decision.