---
title: Simulation/VehiclePermissions
permalink: /Simulation/VehiclePermissions/
---

# Introduction

SUMO allows modelling access restrictions via a predefined set of
so-called vehicle classes. Each vehicle has a vehicle class and each
simulation lane allows a set of vehicle classes. Vehicles may only drive
on lanes that allows it's vehicle class.

This is useful for describing multi-modal traffic scenarios by
distinguishing between passenger cars, bicycles, tram and pedestrians.

# Vehicle definition

The vehicle class of a vehicle is defined by first defining a [vehicle
type](../Definition_of_Vehicles,_Vehicle_Types,_and_Routes.md#vehicle_types)
with the appropriate [vehicle
class](../Definition_of_Vehicles,_Vehicle_Types,_and_Routes.md#abstract_vehicle_class)
and then[assigning that type to the
vehicle](../Definition_of_Vehicles,_Vehicle_Types,_and_Routes.md#vehicles_and_routes).
An example is given below:

```
<routes>
  <vType id="myType" vClass="bus"/>

  <vehicle id="veh0" type="myType" depart="0">
    <route edges="a b c"/>
  </vehicle>
</routes>
```

If no such definition is given, the vehicle class defaults to
*passenger* (normal passenger cars). By setting the  attribute, a set of
[default type parameters](../Vehicle_Type_Parameter_Defaults.md) is
automatically assigned to better correspond to a typical vehicle of that
class.

# Network definition

In a *.net.xml* file, each lane defines a set of permitted vehicle
classes. This definition is either

- taken from [custom input
  files](../Networks/PlainXML.md#edge_descriptions).
  It possible to define permissions for edges or individual lanes. To
  simplify definition, either the permitted classes or the prohibited
  classes can be specified using the attributes `allow, disallow`.
- set using the option **--default.disallow** {{DT_STR}}**,...**
- imported from an input source such as
  [OpenStreetMap](../Networks/Import/OpenStreetMap.md) according
  to a [customizable
  heuristic](../Networks/Import/OpenStreetMap.md#recommended_typemaps).
- or set via [NETEDIT](../NETEDIT.md#inspect). Convenience
  features exist [for adding bicycle lanes, bus lanes and
  sidewalks](../NETEDIT.md#restricted_lanes).

For visualizing access permissions, either
[SUMO-GUI](../SUMO-GUI.md#road_access_permissions) or
[NETEDIT](../NETEDIT.md#correcting_road_access_permissions) may be
used.

# Special cases

The vehicle class *ignoring* may drive on any edge.

The vehicle class *pedestrian* should not be assigned to a vehicle.
Instead, pedestrians should be modeled as [walking
persons](../Simulation/Pedestrians.md). During network building, no
direct connections between pedestrian-only lanes are built. Instead
options for [building pedestrian
intersections](../Simulation/Pedestrians.md#building_a_network_for_pedestrian_simulation)
should be used.