Car unit

A unit of measurement in traffic sciences is called a car unit (PKW-E or PE for short) . The aim is to express the different loads on a road by different types of vehicles in one size.

calculation

${\displaystyle {\text{N}}_{\text{PE}}={\text{f}}_{\text{Rad}}\cdot {\text{N}}_{\text{Rad}}+{\text{f}}_{\text{Krad}}\cdot {\text{N}}_{\text{Krad}}+{\text{f}}_{\text{Pkw}}\cdot {\text{N}}_{\text{Pkw}}+{\text{f}}_{\text{Lkw}}\cdot {\text{N}}_{\text{Lkw}}+{\text{f}}_{\text{Lkw mit Anhänger}}\cdot {\text{N}}_{\text{Lkw mit Anhänger}}}$

The assessment value in car units results from the weighted sum of the number of motorcycles , the number of cars / vans , the number of trucks and buses , and the number of trucks with trailers, tractors and heavy vehicles. The factor is defined as 1.0. For the other factors, depending on the subject, such as B. Capacity calculation, clearing times of traffic lights or noise calculations, different values ​​are assumed. As a general rule: . However, the specific determination of the factors must be determined on the basis of the individual values ​​such as capacity consumption, average speeds and noise emissions. ${\displaystyle {\text{N}}_{\text{PE}}}$ ${\displaystyle {\text{f}}_{\text{Pkw}}}$ ${\displaystyle {\text{f}}_{\text{Rad}}<{\text{f}}_{\text{Krad}}<{\text{f}}_{\text{Pkw}}<{\text{f}}_{\text{Lkw}}<{\text{f}}_{\text{Lkw mit Anhänger}}}$

A possible division factors for the calculation of capacity of roads called the Manual for the design of road traffic facilities with: .
${\displaystyle {\text{ f}}_{\text{Rad }}=0,3}$
${\displaystyle {\text{ f}}_{\text{Krad}}=0,5}$
${\displaystyle {\text{ f}}_{\text{Pkw }}=1,0}$
${\displaystyle {\text{ f}}_{\text{Lkw }}=2,0}$
${\displaystyle {\text{ f}}_{\text{Lkw mit Anhänger}}=4,0}$

Individual evidence

1. ↑ Univ. Doc.Ágnes Lindenbach, PhD: Lecture Roads and Railways I. ( Memento from August 11, 2014 in the Internet Archive ) (PDF; 583 kB), p. 33
2. ↑ Hans-Peter Krings: "Traffic planning traffic volumes" ( Memento from August 9, 2014 in the Internet Archive ) (PDF; 151 kB)
3. ↑ FGSV: Handbook for the dimensioning of road traffic systems, 2001