3 APROACHING AND METHODOLOGY
1.2 METHODOLOGY
3.2.2 Field Data Collection/Primary Surveys 1.1.1.3 Preliminary Survey
1.1.1.7 Traffic Survey
The traffic survey aims to determine the existing road conditions, the average vehicle speed, take an inventory of existing roads, and take an inventory of the number of each type of vehicle that passes through a certain road segment in a unit of time, so that the average daily traffic can be calculated as the basis for planning roads and bridges. The traffic survey includes the following activities:
a. Preparation
The preparation of this survey was carried out to plan in detail, relating to
1) survey method
2) preparation of survey forms
3) preparation of survey resources and preparation of a schedule for the implementation of the survey
b. Data Requirements
The secondary data required for this study are data concerning roads, such as characteristics and traffic volume.
c. Survey volume vehicle
The primary survey was carried out by direct observation in the field, namely conducting a traffic count survey, for 3 days (2 working days and 1 holiday) with a survey period of 16 hours (06.00 to 22.00) and carried out in three positions, namely:
1) Roads
2) Intersection of three roads 3) Crossroads
All types of vehicles passing either from the front or from the rear must be recorded for 24 hours in congested areas, and 12 hours in non-congested areas with an interval of 3 hours. Each column is at least 2 people with the equipment used, 1 person, I counter and a predetermined survey format.
1) Traffic Calculation posts which are divided into several types of posts:
i. Class A posts are traffic count posts which are located on roads with a high amount of traffic and have an LHR >
10,000 vehicles.
ii. Class B post is a traffic count post which is located on a road segment with a moderate amount of traffic and has 5,000. < LHR < 10,000 vehicles.
iii. Class C posts are traffic count posts located on roads with low traffic volume and have LHR < 5,000 vehicles.
2) Post Location Selection
i. The postal location must represent the average daily traffic volume of the road section unaffected by the non- representative shuttle traffic of the section (commuter traffic).
ii. The post location must have sufficient visibility in both directions, so as to allow easy and clear vehicle registration.
iii. Postal locations cannot be placed at crossroads.
3) Post ID
Each routine traffic count post has an identification number, consisting of one uppercase letter and followed by a three- digit number. Capital letters A, B, and C provide identity regarding the type of calculation post class. The next three digits are identical to the number of the road segment where
the posts are located. If a road segment has more than one postal calculation, then the code for the second post, the first digit, is replaced with 4 and so on. The order of posts should start from small kilometers to large kilometers on the road segment.
Example:
i. On the 002 road section, there are several class A posts with their postal numbers written: A002; 302; A402 to A902.
ii. On Jalan 157 there are several class B posts, the post numbers are written: B157; B357; B457; up to B957.
iii. On the 057 road section, there are several class C posts, the post numbers are written: C057; C357; C457 to C957.
4) Calculation Period i. Class A Posts
For Class A Posts, the calculation is carried out with a period of 40 hours for 2 days, starting at 06.00 am on the first day and ending at 22.00 on the second day.
ii. Class B Posts
For class B posts, the calculations are carried out as in class A posts. The calculations are carried out at class B posts according to a predetermined schedule.
iii. Class C Posts
Calculations are carried out with a period of 16 hours starting at 06.00 am and ending at 22.00 on the same day specified for the execution of the calculation.
5) Vehicle Grouping (RTC-Manual)
In calculating the amount of traffic, vehicles are divided into 8 groups including motorized vehicles and non-motorized vehicles.
Table 5. The types of vehicles
Group The types of vehicles that fall into this group are:
1. Motorcycles, scooters, mopeds and motor vehicles 3 Wheel.
2. Sedans, Jeeps, and Station Wagons.
3. Microlet, Pick-up, Suburban, Combi, Minibus.
4. Pick-up, Micro Truck and delivery car or Pick-up Box.
5a. Small bus 5b. Big Bus
6. 2 axle truck.
7a. 3 axle truck.
7b. trailer truck
7c. Semi Trailer Truck.
Introduction to vehicle features:
i. Beetle: a bicycle with a 75 cc (max) engine attached to it.
ii. Three-wheeled motorized vehicles include: bemo and bajaj.
iii. Except for Combi, generally as a public passenger vehicle, a maximum of 12 seats such as mikrolet, minibus, pick up which are provided with canvas/plate shelters with routes within the city and its surroundings or rural transportation.
iv. Generally, as a goods vehicle, the maximum rear axle load is 3.5 tons with a single rear axle single wheel (STRT).
v. Small Bus is a public passenger vehicle with a seat between 16 to 26 pieces, such as kopaja, metromini, elf with a single rear double wheel axle (STRG) and a maximum vehicle length of 9 m as bus 3/4.
vi. Big Buses are public passenger vehicles with seats between 30 and 50, such as night buses, city buses, intercity buses measuring + 12, and STRG.
vii. Axle trucks are goods vehicles with rear axle loads between 5 and 10 tons (MST 5,8,10 and STRG).
viii. 3-axle trucks are goods vehicles with 3 axles which are located STRT and SGRG (double axle double wheels).
ix. The trailer truck is as vehicle no. 6 and 7 which are towed with the tailgate and connected by triangular rods. Also called Full Trailer Truck.
x. Semi-trailer truck or outboard truck is a vehicle consisting of a truck head with a 2 or 3 axle which is jointly connected to a plate and a body frame with rear wheels which have 2 or 3 axes as well.