These systems display the arrival time of vehicles to stops, stations or airports, and typical information displayed is the time in minutes to the next scheduled arrival. Passengers can be updated on the movement of transport vehicles with passenger information systems. A high threshold will result in more services on time, but may result in the managing corporation or government body being accused on not reporting correctly. The choice of threshold for lateness is an important one, with a low threshold resulting in a lower on time performance statistic. For example, if a bus is 4 minutes 20 seconds late, a rules may be applied that a bus is only late when later than 5 minutes, so this service would be counted as on time. When the comparison is made between the timetable, and the actual arrival or departure time, a rule is applied to determine how much of a deviation is permitted. Departure times are normally more on-time than arrival times, as incidents and breakdowns occur that reduce the on time performance. A comparison is often completed for arrival time rather than departure time, but both are common. To calculate the percentage of vehicles on time, comparison is needed with the timetable. Buses, unless they are separated from road traffic, will be heavily affected by congestion. For example, rail services often operate on a separated right of way, and so are not affected by road congestion. The ability of different transport modes to meet on time performance statistics depends on the degree to which they are affected by external factors. On time performance is particularly important where services are infrequent, and people need to plan to meet services. Transport services have a higher utility where services run on time, as anyone planning on making use of the service can align their activities with that of the transport system. Almost all transportation systems have timetables, which describe when vehicles are to arrive at scheduled stops. On time performance is a measure of the ability of transport services to be on time. The level of on time performance for many transport systems is a very important measure of the effectiveness of the system. On time performance, sometimes referred to as on time running, is normally expressed as a percentage, with a higher percentage meaning more vehicles are on time. In public transportation, schedule adherence or on-time performance refers to the level of success of the service (such as a bus or train) remaining on the published schedule.
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