  We present a non-local version of a scalar balance law modeling traffic flow
with on-ramps and off-ramps. The source term is used to describe the traffic
flow over the on-ramp and off-ramps. We approximate the problem using an
upwind-type numerical scheme and we provide L^\infty and BV estimates for the
sequence of approximate solutions. Together with a discrete entropy inequality,
we also show the well-posedness of the considered class of scalar balance laws.
Some numerical simulations illustrate the behaviour of solutions in sample
cases.
