  The distance $d(u,v)$ between the vertices $u$ and $v$ of a connected graph
$G$ is defined as the number of edges in a minimal path connecting them. The
\emph{transmission} of a vertex $v$ of $G$ is defined by
$\sigma(v)=\sum\limits_{u\in V(G)}{d(v,u)}$. In this article we aim to define
some transmission-based topological indices. We obtain lower and upper bounds
on these indices and characterize graphs for which these bounds are best
possible. Finally, we find these indices for various graphs using the group of
automorphisms of $G$. This is an efficient method of finding these indices
especially when the automorphism group of $G$ has a few orbits on $V(G)$ or
$E(G)$.
