One problem with this method is where very large stops or interchanges are not at the start and end of the bus journey, but in the middle, and the start and end of the route are bus depots or other small stops for which on time performance statistics are not as important. One method is to calculate on time performance for only the start and end of the bus route, which can produce meaningful statistics. On bus services an on time performance can be calculated for each and every stop. In this situation on time performance may be calculated at the major interchange, rather than the start and end. Things are substantially less clear for bus services, where an on time performance can be calculated for each and every stop. On time performance for aircraft is simple to calculate as aircraft depart and arrive at airports, and these are clear points to complete the on time performance calculation. OAG and Cirium regularly publish airline on time performance rankings and data. Airlines typically perform well when their on time performance reaches 90%. The 15 minutes rules for on time performance is commonly applied throughout the airline industry. Iraqi Airways, an airline, uses a rule that aircraft that depart within 15 minutes of scheduled departure are on time. Numerous websites exist for reporting on punctuality for airlines, often operated by government departments. This type of transport system will not have any meaningful measure of on time performance.Īirlines are closely monitored on their on time performance. Where services are delayed, more information can be provided, such as alternative transport options, or estimated time till services resume.Ī small number of transport systems operate on the principle of go-when-full. Some of these systems have been extended to include apps to show the movement of trains/buses/planes/ferries. 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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